so the brakes were squishy, checked the pads and fluid, everything was good, took it to my mechanic and they said the brake vacuum pump was going. tried to search online and getting mixed results from the search FCP is trying to sell me 5 screws and 2 o-rings for $60, parts geek shows me 2 totally different vacuum pump assemblies. without disassembling the car, is there a way to tell which model i have to replace?