I have done the "spares units" loop with an original Fluke 87. The input receptacle should be available on eBay, I think I sourced one there before. The newer Fluke holsters (like on the 87V) fit the 80s series, I just found two of those cheap on eBay.
I have sold all my remaining parts, so can't help. If you are looking for a broken unit keep in mind that the LCDs on these are very difficult to source, so look out for meters with smashed displays.