Purchased the VAC billet machined seat floor mounts (VAC-FMA-E30) for my car this past week. Sparco Torino 2's and the billet floor mounts don't even come close to working. I was planning on using them with my Sparco sliders as well, but the mounts are designed too far apart. I would have to drill new holes in the floor to move them away from the transmission hump and couldn't see that being value added. I called VAC to ask if anyone else had the same issue, but they told me that "we don't have enough feedback for our data base yet".
Just FYI for those contemplating buying the VAC seat mounts with Sparco seats. VAC Fail.