DISSIPANTE 3U Drilling and tapping into radiator

hello friends, foes, lovers;

I've come across the conundrum that I do not know how in the world I would drill and tap my own holes, never mind where I would source the appropriate screws to mount my amplifier modules to the radiators in a dissipante 3U (or any other amp chassis for that matter)


-Thanks all in advance,
Andrew B

PS for anyone saying "check the archives" or "theres thread for that already"... booo0000o I looked my best, I'm not used to these forums and uh-oh-boy I cant find an efficient way to search for this topic <3 please understand <3