Front Wheel cylinder issues - Front Axle ID

[hkopp]

I own a 60 K10, 20 yrs ago after losing another rear axle in the 10 bolt eaton I found another 60's (so I was told) 4x4 that had the right width, front dana 44 with the same knuckles, etc). I exchanged the axles and drove the truck for another 3 years then parked it until this year. Since its been sitting so long I bought all new brake shoes, rubber lines, and wheel cylinders. Thats where my problem lies.

The front wheel cylinders I removed are narrower than the replacements by about half an inch, and they will not fit between the upper shoe brackets. Also the line is bigger on the old ones. The backing bolts are aligned on the old and new ones, I've looked at other years and see the attaching bolts are offset. With this info I started looking for numbers on the front and rear axle housings to find out what exactly I installed 20 years earlier. If anyone has any info on this pls let me know. Thanks!!