Valve locks 1201x springs

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?