Does your top deck have two pieces staggered in height? If so, its the V1. The older kit did have quality control issues as far as how some of the holes were drilled. I actually had to do alittle dremel work on my first STR4 Pro V1 and the sport kit as the holes were not done very well.

Academy did a much better job on the SB V2 and I am assuming the STR4 Pro. One thing to watch with the Pro is the caste axles will break on a decent hit. They actually shere off at the pin hole. You can however find CVDs that will work. I know the hot mod for the SB V1 at least was to utilize HPI CVDs (if you are still using the stepped hubs which has a smaller outer bearing) but I am not sure what bone to use for the sedan.