Not quite: IIRC,the 8500 morphed into 8600 and the 9500 morphed into 9600 . . .
. . . three slot 8x00 MiniTowers/Mobos as opposed to the six slot 9x00 Full Tower Variety . . .
. . . the 7500 and 7600 were desktop versions of the mid-towers, ergo three slots, hence, the 8500 + 7600 = 8600 conversion question.
I've got a complete 8500, a complete 7600 and the inner shell of what was once a complete 9500 that was the longtime home of my PEx Mobo before that was converted to its current "PEx in a Drawer" configuration.
I'm leaning against mucking around with my 8500 after all. I've got a couple of low, wide ATX cases ready for Mac re-casings and Radius 81/110 faceplate conversions. This is all part of a next rev of MacFurniture development. This time it's more of a display than a workstation project. }
Have fun with your 8500 Mid-Tower, strimkind! What have you got ploanned for the third PCI Slot?