I would like to know if anyone has purchased rear poly bushings from IPD or the same from Groton? I am looking at the price difference and think there may be some quality difference. The Torque bushing in "polyurethane" from IDP is $80.00 a set while the "urethane" set from Groton is only $44.00. Notice the diffenence in words from the two suppliers, polyurethane and just urethane. Just thought someone might have had experience with both. Thanks.. Max