So you thought your E30 sport seats were Recaro’s? Think again the E21 sport seats were Recaro’s, not your E30’s. However real Recaro sport seats were offered as a rare option on E30’s. As seen here clearly stated by BMW themselves:
Furthermore Alpina offered Recaro seats in their E30’s also but again Alpina’s are rare and bring quite a premium!
Real OEM E30 Recaro seats are all but impossible to find, if you have a pair, in my opinion you have something very valuable!
What a lot of people do is take seats out of a VW MkII GTI because they are very similar and then make mounts.
This is both a “interesting stuff” and “Do it yourself”; because the mounts look fairly easy to make if you have any old flux cored MIG welder.