caps?

Ok, I have been kicking around the idea of making up my own cylinder gas tanks because I need a couple for my bikes. But I am hung up on the filler neck and cap. I know I can buy em from chopper shops like Lowbrow Customs, etc. but I have the stuff to make my own so that's what I would like to...

this may be a dumb question, but I'm wondering if you use lightweight retainers and keepers on stock valves do you need to use lash caps? can you use the stock ones? or do the retainers and keepers only work on ss valves? thanks this is my first engine build.

i bought a new yellow and it had 1 cap on the exaust valve . i changed the springs. did i get cheated a lash cap? on carb side. if so im sad

I am making a few round gas tanks for a member here on OldMiniBikes and I have ran out of tanks to steal the caps off of. Were do you other guys get your gas tank caps?