Thanks. But I don't think that's it. That type of screw and washer is generally available, but the part I once had has more of a conical shaped washer that's about 1/8" long. The part you show will compress the covering and padding around the mounting hole, but the OEM part keeps the head of the screw flush with the cover.
David, that's what we are saying. The washers as original are NLA.
I used the upholster screw in the photo above and it worked fine.
Here are some washers that may work but seem to have too much area around them.
http://www.mcmaster.com/#standard-countersunk-washers/=lgs2vk
Cup Washers for Oversized Holes
Cover oversized holes such as the end of a pipe or tube with these bowl-shaped, flanged washers. You can even press them into soft surfaces to create a flush recess for screw and bolt heads. Made from zinc-plated C1008-C1010 steel, they have a minimum Rockwell hardness of B40 and an overall height of 0.197".
Screw
SizeID (A)OD
(B)(C)(D)Thick.,
Min.-Max.Pkg.
Qty.Per
Pkg.No. 107/32"1 1/2"0.44"0.73"0.03"-0.07"592856A101$5.63No. 121/4"2 1/2"0.63"1.02"0.05"-0.08"592856A1037.941/4"9/32"3"0.56"0.92"0.05"-0.08"592856A1059.425/16"11/32"2 1/2"0.63"1.02"0.05"-0.08"592856A1077.943/8"13/32"3"0.75"1.22"0.05"-0.08"592856A1099.42