On threaded shock collars, I used standard ofna 9.5 collars, as I couldn't find the Sportwerks brand available. The LST diff housing are identical, but the stock plastic Sportwerks have a better fit, I know, I just compared the two side by side and liked the way the gears fit in the stock housing better. I also just went to 40 wt in the rear shocks, as they changed the jumps at my track and my rear seemed to be bottoming out a bit.