The original tranny in a 91 DA would be an A1 or S1 (but transmissions are swapped all the time). If it's an actual 92-93 YS1 + $250 on top or if it's a 90-91 A1 or S1 + $300 on top. It should have a label on it saying what it is or if it doesn't have a label, here is how you tell:
on the bottom side of the transmission, 92-93 has these two bolts:
90-91 does not have them:
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