So after replacing my lower front right a-arm this weekend (hit a rock) I noticed upon loading my RZR S back into my trailer that I also have an issue with the right rear lower control arm also. I have a good crack running around the weld area. I was fortunate to hit Chaparral and find they had one in stock. I'll do a field change in Ocotillo next week. But as a word of advice I suggest guys with the 2009 and 2010's check theirs. I noticed on my new replacement arm the weld is much better. I also checked the RZR's on the showroom floor and saw they have all been changed.