IMO your concern of knowing the exact diameter of the tool is not necessary. The sleeve is smaller than the opening in the bellhousing so as long you do as jp said and make it the same diameter as the sleeves outer most diameter you’ll be fine. The only other feature the tool has is an inner ring that is the diameter of the sleeves opening which helps center the tool. You can cut these two out of a piece of plywood and stack them to achieve this.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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