I was unaware any were needed. I've never seen one, anyway. Always used a screwdriver or icepick. Apply gasket
to cover (with sealer), align holes and allow to "tack up" (don't forget the pump inner set). Apply light coat of sealer to engine
face, and place cover using aforementioned tool to verify the bolt holes or place 1st two bolts on either side of cover before placement so that your aligned on the 1st attempt. Replace bolts in a "crossing pattern" fashion and tighten and torque to engine specs.
Place shaft seals
BTW, make sure the cover and engine gasket contact zones are CLEAN.
"Behind every great man there is a woman, rolling her eyes."
But not for long! Now she's gone!
and peace and tranquility reign forever!
1969 Morgan 40 Cruising Ketch