If you are putting them in a coupe you pretty much need seats from a coupe. Sedan seats won't tilt forward so you won't be able to access your rear seat.
Sedan seats dont tilt forward so you wouldnt be able to get in your back seat. Find some coupe ones, but fyi you'll only find comfort seats in blue, nothing with bolsters. Id say find a set of sport seats with wrecked upholstery and have them re-done.
I have some but not in great condition from a cabrio. So yes, you can find them on occasion. lol I wouldn't consider blue rare, I would consider cardinal red rare..
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I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.
latest addition as of 2013-Gold 87-325is auto! it's a keeper!
I'd say blue is more rare than red seeing as most blue interior e30's are probably in junkyards at this point. A cardinal sport interior is worth saving, but a blue interior would not be for most people.
I have 2 sets.. one in my car and one in my garage..so to me not that rare. lol
__________________
I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.
latest addition as of 2013-Gold 87-325is auto! it's a keeper!