I have never seen those upgrade heads, but now I'm curious. G1 heads on RID bodies sounds hilariously ill-fitting.
I will see if I can find them in my parts bin and post pics; indeed, they were not a great blend of aesthetics. It was the height of my Geewun phase, like I said, I'm glad they were reversible.
Did this group make their own products before or after Unicron.com started making theirs? Because the Unicron.com upgrade kits were some of the first third party products ever.
They were based out of Canada, I believe. Pretty sure they were fairly well-established making repro parts by 2001, when I first found them. Mostly they did resin casting of parts like fists, guns, and a Matrix for Optimus Prime and similar parts for other figs. There were a few custom parts in their repertoire by the end, but then the owner had a stroke, and while some friends helped fulfill existing orders, the business ended soon after. Probably my favorite part I got from them was a Firebolt Targetmaster molded to be compatible with the Rodimus Major reissue figure.