This part is listed by BMW as BMW part number 34211158912 (34-21-1-158-912) and is described as OEM Rear Brake Pads - E30 318is, 325e, 325i, 325is, 325ix.
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BMW Fitments:
3 Series
E30 (84-91) > 318is
E30 (84-91) > 325e
E30 (84-91) > 325es
E30 (84-91) > 325i
E30 (84-91) > 325is
E30 (84-91) > 325ix