Even for Recaro, there are many grades and fabrics materials.
Assume all is used and in good condition with original Recaro Railings:
1. For evo 3, is the first version with big Recaro headings on the back. Grey color, microfibre materials. Market ard 1.5-1.8K. Quite old so not easy to get used seats in good condition. Not sure abt e1-e2. Hardly came across their seats.
2. For evo 4, is similar to Type-R seats in DC-2, EK9. (Microfibre materials with 'Batik' design..).
Market Fetching ard 2.5K.
3. For evo 5-6.5, they are similar in design just different in the color and of course, 6.5 with it's TME emblem in it. Market Fetching btw 4K-6K. Anything below is a good buy !
4. For evo 7, they are similar with 8 & 9 design but 9 fabric comes in leather (Uncle Taxi type..LoL). Not sure about 8-9 but for 7, a healthy price of 4.5K (not much sought after unlike TME seats).
As for 7.5, S9 is right..is non Recaro sports seats so I would pay anything more than 1K for it even in superb condition. Looks more like those Civics EG9 seats with a little 'bucket' support.
Hope this helps..