If you can’t find one , u can always pan lube and if it needs
Sizing put it through a lee push through sizing die.

I have had numerous custom bullet molds made where there is no top punch available.

So I buy a top punch for that diameter bullet.

I drill out the center.

I fill the drilled out top punch center with epoxy and push it down on a bullet coated with a release agent using my sizer - my bullet lube works great as a release agent and some people use floor wax.

Epoxy hardens and then I have a top punch with the correct nose fit for my new bullet.

Picture of a beat up old 663 top punch converted with epoxy for my .40 caliber Money bullet on right side of second picture.

I have simply put a wad of tin foil into the cavity and let the bullet form it as I squeeze it into the die. Had bullets but no dies for them all. Works pretty good and can be changed back if wished. The wad usually stays inside pretty much on its own, but a tiny drop of tacky glue will keep it there if not.