-'87 GL with factory air-

I'm getting ready to install some rear shoulder belts, and I'm evidently
going to have to cut or notch the 'D' pillar covers so that the belts will
have room to do their thing. I've seen indirect pictures of this setup, but
what I'm asking for are straight on pictures of the cut-outs and the cover
in general, preferably with a tape measure alongside so I can get an idea of
dimensions, shapes and so on; or to put it another way, whatever information
visual or otherwise that the person providing would believe to be useful to
someone undertaking this mod.

I have a suspicion that the covers themselves are of a somewhat different
shape, but I'll just have to deal with that best I can.

Thanks in advance,

Robert