30mm ball tops?

[Speed DeMonaco]

I'm trying to find out where I can get some red and black 30mm ball tops with 5mm threads.

I got these on ebay but they're lopsided and are about 60% scuffed in a ring around the middle.
https://www.ebay.com/itm/M6-M8-M10-M12-Joystick-handle-Ball-Top-Handle-Gum-Balls-Red-Black-2PCS-/332381761584?var=&hash=item4d637f3030:m:m57dJ16F2-_-fmaKcj_UouA

Mike's arcade has black ones, but no red ones and I don't know what size threads they have.