This is what I went by from the spacer manufacturer.
"If you are planning to put an '83-'93 S-10 transmission behind your 235/261 Chevy inline, this is the adapter that you need. Used in conjunction with a '48 to '62 Chevy truck bell housing, this adapter allows for an unmodified T-5 to direct bolt to the engine. The standard S-10 T-5 has a longer input shaft and bearing retainer than a standard GM 3 or 4 speed. This adapter compensates for that."
