I believe there was a discussion a year or so ago where it was mentioned the rubber plates were reproduced by a region several years back and were at the time almost gone. I think the gist of that discussion was a vendor - packards1, I think - still had a set and was offering to deliver to Hershey if the buyer wanted them.
On Kanters website under 40-50 parts, Group 30.8005, he has this notation:
30.8105 Door sill rubber step plate set, 1942-47 Clipper, 1948-50 INQUIRE Perhaps he still has some so it might be worth a phone call to see.
If that fails and Kanter is sold out or no other suggestions, wonder about the possibility of some being made. This company that makes running board rubber also makes specialty rubber and hard to find items. I wouldn't think those door pieces should be any worse than some he has pictured. Of course like anything specially made, the price may give palpatations.
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