Had a long day with the International but it paid off. I went down to the junkyard and grabbed a perfect master cylinder cap. The GM dealer said they weren't available anymore and they ordered me the wrong one. Oh well. I also switched over the cruise control accumulator and plastic vacuum lines. The 91 car had a broken line and was missing the holder entirely. I lucked out again with the 89 parts car as it had a perfect intact system with holder. I also practiced on some junkyard cars to figure out how not to break the line and holder.
This vacuum line section was also a mess but not anymore!
The driver's side inner fender was damaged/missing and the parts car saved the day again! Here's what was on the white car, what's left of it anyway.
Parts car with complete inner fender plastic and hardware. Tabs were rusty but still worked with holding the screws.
My original worn out decal cap and broken vacuum line. Line holder is missing.