Whose retainers?
Why not buy the matching locks from the same company?
If you or your engine man are not SURE you have the correct matching and compatable parts, buy a matched set from a known big name supplier!
Dropping a valve and destroying a piston, head and maybe block over trying to save a few bucks just doesn't make any sense!
This is no place to try and save a few bucks. If you think you found something that seems to work, is it worth your sanity to worry about it every time you swat the throttle?
TIMINATOR