Hi massive,
URO, Pelican sells them also:
Porsche 924, 944 & 968 (1976-1995) - Panels & Doors - Page 3
Check ebay, amazon +++ Part number is usually 47759562201C
www.uroparts.com
Black and Brown available.
No problems for over a year but I changed all 3 at once on both cars. I found if you leave one OEM Porsche window switch in the circuit it fails.
John