You have to take the stock off to see. Some are straight cuts at the back like normal AK's and others have a slant cut. The theory I've read on that is they were gonna be underfolders before the '89 import ban came.
If you have a straight cut then regular AK furniture should work(that is regular Chinese furniture, Chicom receivers are a bit thicker than others), slant cut's a bit tougher. I would normally have said Ironwood Designs but they're closed up now. I had a milled MAK 90 a while ago with a slant cut, had a furniture set from Ironwood on it that was sweet.
He's a site makin furniture for em
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MAK-90 Slant-Cut Stamped Stock
We have slant milled and stamped mak-90 to test fit on. All you should have to do it pound it on and sink your screws . Full sets of furniture will probably be made out of hickory. If you have a darker polytech brown we may do the stock in white oak . Comes with NON trapdoor, smooth or ribbed...www.kalashnicarver.com
They had different receivers with a knock out(kind of like an electrical panel) you could remove to install the UF stock.

