I don't think I'd trust mounting a belt driven vac pump with the (6?) small allen head bolts of the OEM vac pump. Army, it's been alluded to that the rebuild parts you can still buy may not be the same quality as the original pump, so rebuilding may be an iffy proposition. I think an electric vac pump is the easiest and least costly. I did a quick test with an elec pump and plan to do more when I find the time.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked