EarL ,I too ran 416 S until the left started leaking oil , switched back to the oe style while i rebuild the 416 ($18.00 for the kit) . the problem is i enjoy the oe ones as much , so i have not gotten around to do the rebuild

it seems fairly simple.Ebay always has oe shocks. paid 35 buckets for the ones i m using + got the old ones laying arond.