Can anything else be used to hold the rear Bump Stop up on a wagon other than the dealer pin part? It looks like a part that I have seen before? Any ideas?

 

You're talking about the little "rubber" bumpers on the back door... on the left and right, above the car's bumper?

 

If you're talking about the rear suspension and the stop inside the spring they are available from a few places. You can try to Google it also.

Sweedishautoparts.com

REAR SUSPENSION AND RELATED 2WD Volvo 850
APPLICATION PART # PRICE Click to enlarge!
850 1993-1997 Washer OES 1387906 $ 9.64 Buy Now #1 850 1993-1997 Bolt OES 987502 $ 2.83 Buy Now #2 850 1995-1997 Spring Anchorage OES 9140177 $ 12.23 Buy Now #3 850 1993-1997 Bump Stop Marked S AFT 3516327 $ 12.50 Buy Now #4 850 1993-1997 Bump Stop Marked S OES 3516327 $ 27.71 Buy Now 850 1993-1997 Locating Pin OES 9157631 $ 1.11 Buy Now #5 850 1993-1997 Locating Pin AFT 9157631 $ 1.00 Buy Now 850 1993-1997 Spacer OES 1387907 $ 8.72 Buy Now #6 850 1993-1997 Spring Anchorage Nivomat OES 9140723 $ 7.60 Buy Now #7 850 1993-1997 Spring Anchorage W/O Nivomat OES 3546435 $ 9.64 Buy Now 850 1993-1997 Spring See Spring Session Spring Not Available #8 850 1993-1997 Shock See Shock Session Shock Not Available #9 850 1993-1997 Shock Mount Rear Upper 2 needed per car W/O Nivomat AFT 9461524 $ 13.86 Buy Now #10 850 1993-1997 Strut Mount for Nivomat OEM 9140847 $ 26.59 Buy Now 850 1993-1997 Lock Nut OES 985908 $ 3.24 Buy Now #11 850 1993-1997 Bolt 2WD AFT 985187 $ 0.95 Buy Now #12 850 1993-1997 Bolt 4 needed OES 985188 $ 1.14 Buy Now Click here for more 850 FAQs!