Trey, i have the same seats as yours. The dimensions from Recaro really haven't changed much over the years. I went the Wedge route, they were kinda pricey, but super stout, as if you autocross or track, you'll need something beefy.
On your 1/8 to 3/16 question, this is one of those "safety" cases where bigger isn't just better, its also an insurance policy of sorts, its there when you need it.
Wedge is a small company, when i called, they answered from the shop, if you get my drift. They use a german slider (compatible with the Recaro spec iirc) and use their jig to weldd up
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Mike
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