Measuring the gap in my spare transmission support I get around 3/8" to 5/16". Can't say ever remember replacing the rubber pad. Need to crawl under my truck....

The rubber supports are 3/8" thick. No idea where I got them, but it was apparently back in 2004. Remind me of a piece of tire sidewall. Has belt material in the middle.
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Craig

My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear
My truck ....... Respect The Rust
If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.