depends what parts
but if you are going to buy parts from the USA/Canada, you might want to look for 2005+ RSX parts. The new facelifted model..
for example, the stock strut bar is different, so hence engine torque dampers made for these two models are slightly different, obviously bodykit is different, and also the suspension's spring/damper rate is different (can't remember if it's either/or or both)
Tein SS and Mugen are the two brands that i know of first hand that has two suspension kits (two Tein SS for DC5) because of the two models.

