Welcome!

I have an 87 that also suffers from no center vents..can't decide if I want to go through with the repair

Anyway, here is a thread about removing the dash and replacing the pods on an 87 300d, I don't know that there is any difference between an 87 and 91. Someone else on here can help with that part!

W124 climate control vacuum pod replacement

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Dan
2005 E320 CDI - 246k
1987 300SDL TD05-16g, Herlevi pump, Elbe manifold, 2.47 LSD - 213k
Past: 1987 300D - 264k