Yeppers! i run a Rivera Ported q212.....i got it for 250$, about 8 years ago, used and beat up...some TLC, and she's a dandy. it originally had those GHASTLY gt12m70's in it, and i HATED THEM together..they're SO BLAH!~!!!!!!. so, on a whim/hunch/shits-n-giggles what the hell type moment, i replaced those with 2 G12K-85's (out of a crappy crate amp that i found at a garage sale for 10 bux) and now it's the best sounding cabinet i own, hands down.
matter of fact, i really like those speakers and, for 10$, they were a gem of a find. i didn't even know what the crate speakers were, as there were stickers on the back of them that i just couldn't get off, but after i put them in there and tried them, i HAD to know what they were, so i checked the #'s on them..and low and behold, i had me a pair of 10$ g12k-85's!