From: Jon Furst
Email: jfurst68@yahoo.com
Date: 13 Jun 2001
Time: 02:55:55'85.5 isn't late offset. Late offset started in '87.
Calipers: Same from '84-'88, front and rear
Discs: Same from '79-'86, front and rear
Master Cylinder: Same from '83-'86 944, all 924S, but different than the 924 master cylinder. You can use the '80 or '81 master cylinders on the 924 and not bend or change any brake lines.
You will need to use 924 with 5-lug, early 944 (up to early 85) or 924S front spindles. The '85.5-up cars don't have a hole for the speedometer cable in the left spindle. The right '85.5 and '86 spindles are the same as the early cars.
The '85.5-up cars use a different hub, stub axle, and trailing arm. I don't believe that the components are interchangeable, so the whole trailing arm with axle and hub will have to be swapped over. This may require different half-shafts, but I'm not positive.
If anyone has any more information, please pass it on so we can add it to the FAQ.
Hope this helps,
Jon Furst
'81 931