Hello,
I can see how the *headless bolts* would have been a big help, as it is, I had to use a (leather)strap wrench to pull the waterpump housing every which way to align the a/c bracket, pump housing and the bolt holes in the block. Only then could the bolts be threaded cleanly into the block AND the a/c bracket tightened down without binding anywhere.
I have done OM636(a breeze, pump at eye level on front of head), BMW big 6, Volvo 240 and Opel CIH(Manta A) waterpumps, but this is one job that I hope I do not have to repeat in this lifetime! Back and left arm is still sore from the contortions.
Have a good weekend.

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Nachi11744