If they're Gibson branded ones, they should fit on the pots of Gibsons, or otherwise American made pots perfectly fine. I switched to gold knobs on my #1 LP a couple of weeks ago, they slid right on the pots exactly right. They're the same size and diameter as the Amber ones, or ought to be. That's with a guitar that has a RS Guitar Kit wiring harness on it, but I don't see why it would be different with a proper Gibson wiring system.
Philly Luthier is a good option and a bit cheaper, my only advice is that if you're gonna go that way, make sure you buy the knobs that specify that they are for American made guitars/pots - the ones for Epiphones or other imports use "coarse splines"; the ones meant for American made guitars use "fine splines".