What is it you are trying to achieve. Do you "need" lash caps for rocker geometry............because just using a retainer and lock to increase installed height, doesn't mean you must use lash caps. I am sure you are also aware, that if you DO use a longer valve, it will alter rocker geometry and you might have to raise shafts and get a longer pushrod to correct it. If you have proper geometry now and pushrods, the obvious choice is +.050 locks and +.050 retainers.

Monte