I got the solid one then another and the're both going back because the don't fit. The collar is to short and hits the timing index before seating on the crank this would allow the lower timing chain sprocket to float in and out .3" resulting in failure at some point. The collar on the first one was over 1/2' to short and the second .3" shorter than stock. I also had to shave my starter snout to clear their flexplate and their roller rockers to clear the most commonly used performance valve spring diameter. NO more PRW for me.
To their credit they did send a return shipping tag and offered a refund on the balancers.