I posted the information quoted below in another thread and not wanting to type it again, I quoted it. I currently run Osram CBI bulbs and I should have included them in the original Morimoto kit when selecting the options. I installed a newer kit from mine (2 yrs newer) on someone else's XC90 and Morimoto improved the lens, the cut-off, and the locking ring.
A few more pointers:
Prep
-Obviously, start with new aftermarket assemblies. It makes removing the lens much much easier. IIRC, TYC has better wiring.
-Buy the HID lens locking tool. It helps tighten the HID lens well.
-Watch youtube videos and watch again on retrofitting.
-Ensure you program out the daytime running light using VIDA.
-Double check the new assemblies that you don't have any broken tabs for the internal frame. These tabs pivot for the headlight alignment. I've had to send one back for this reason.
Retrofitting the headlight assembly
-My first set I was afraid of the temp and I set it too low. Then realized I needed to turn the heat up more. The assemblies cool down pretty quick so you will need to heat it up again and again as needed.
-It's easier to cut the back reflector tabs with a dremel cutting disc.
-I cut the hole (with a hole saw) to feed the new wiring on the inner middle part of the back of the housing (between low and high) and used one of the round grommets from retrofitsource.com. If you put the hole on any of the rear round covers, the wiring gets in the way of the headlight assembly sitting flush.
-When you use a belt sander (I had a handheld one flipped upside down) to level the back of the headlight reflector, put a slight upward angle to it. This will help accommodate the alignment for the weight of the HID lens weighing the reflector down. You can use a credit card or playing card to check the angle and flushness of the back of the reflector. Check both the X and Y axis, or up/down and left/right.
-Don't forget to drill a small hole for the high beam shutter wiring
Mounting
-Use 15lb velcro from Home Depot to mount the ballast on a clean panel. It sticks really well.
I bought their Morimoto Mini D2S Stage III kit with 4500k bulbs and Canbus H11 wire harness. I chose the D2S because there are more good OEM D2S bulb selections if I choose to change it, but this projector does require you to bore the hole larger with a dremel (I used a small cylinder like sandpaper and stone attachments). The Morimoto H1 Stage III might not require boring the hole larger. Both kits do require to grind down tabs that stick out at the back of the reflector. Sounds more difficult than it is, which it isn't. It took me all of 3 minutes to clip some of the plastic tabs and grind down flat level.
*Remember to aim new aftermarket headlights to the factory settings on a wall or garage door when they first arrive, then test fit the aim of the HID projectors before doing the final lens seal.
Some other things you might want to get is the highbeam Y splitter (H7>H7/9006) so the highbeam will trigger the HID cover to open (cost me $5 for both sides). Also, some of the Retrorubber butyl glue that is an option on the kit. It helps to use this to reseal the lens. Easy stuff to work with and you don't need a thick run; I stretched it out just a little as I applied it. I also painted the inside black plastic surround to silver so it looks like factory. I did light sanding with very fine grit and bought a plastic primer and a silver top coat, both spraypaints from Home Depot or Lowes. Painting is the most time consuming because of drying time. I used velcro to hold the ballasts (15lb rating is way more than adequate, from Home Depot). You can also watch retrofitsource's youtube videos which also helps to understand the process. Take your time to do the retrofit because excitement could cause you to speed up and make mistakes.
If I were to do it again for the XC90, I would have chosen the 5500k bulbs. I wanted a stock look so I chose the 4500k, but now see that newer factory HIDs on cars project closer to 5500k in color temp. probably because the new daytime running lights are bright white LEDs. Mine still project white on the road, just not as white as I see on other new cars. I might also buy a set of the 9006 extension cords so it gives me a little more length to work with the connections to the ballast.
Lastly, I think retrofitsource runs a continuous discount. Try TRS10 or TRSTEN codes for 10% off. I see it on Facebook ads and their instagram.
disclaimer: I do NOT work for retrofitsource or have any affiliation with them. Just very very happy that I finally took the plunge to having focused bright headlights. The improved safety aspect cannot be stressed enough on this retrofit. Hope this helps.
P.S. I compared the Morimoto ballast to another ballast that a family member had from a different (cheaper) online HID store. The Morimoto one was both larger and thicker. The other ballast from the cheaper store did burn out after 6 months.
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