I am thinking this cab is from 1981. Build date is some time in 1980 anyway. It was originally a 4-speed truck with a mechanical clutch. It will now have a hydraulic clutch, but there is no provision for the clutch master cylinder. I have also heard that the big rectangular hole for the wiring harness bulkhead fitting needs to be moved a little.
Luckily, a friend had saved a piece of the firewall from a truck he scrapped. This is a close-up of the clutch cylinder hole and the bulkhead connector hole.
Lining up the brake booster hole and steering column hole I can locate where the hole needs to be. I can also see how the bulkhead connector hole needs to be shifted.
I should be able to cut the right side out of the rectangle hole and weld it into the left side. Then, I can use the appropriate hole saw to pop out the clutch hydraulics hole.
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