I have this set of seat adapters for sale. They have the support steel welded into the channels for extra strength, and also have the welded nut similar to the original Recaro 320is adapters. Similar to the adapters available from Aardvarc, but have fewer holes.
Measurements: Overall length of the adapters is 14.5" (368mm). Hole spacing on side that mounts to the bottom of seats is 11.5" (292mm) for the outer holes, and 9" (229mm) for the inner holes. Holes spacing for side that mounts to the factory 2002 rails is 13.5" (345mm).
Note, I was able to confirm that these will work with most older Recaros (LX/LS) with the 10.5" (261mm) front to back hole spacing!
$95 shipped for the set. Payment via PP.