new 64 plymouth valiant rear bumper?
Cuda Mike was mentioned earlier in the thread. I have seen him have rechromed rear bumpers on ebay. Right now he only has a front bumper on there but I guess the price would be about the same.
http://www.ebay.com/itm/1964-1965-P...ies&hash=item19d8b5e587&vxp=mtr#ht_265wt_1021
That should give you a ballpark, but call him and I'm sure you'll get a written offer for a restored rear bumper to show the insurance company.
They are pretty good, the previous owner of my '65 wagon bought both bumpers from him.
Good luck!