I do, indeed, have "P" style pedal mats.  They are reproductions
in rubber and measure 4 inches by 9-1/2 inches, approximately.
The thickness varies from about 3/16 inch to 1/4 inch.  I have
about a dozen pairs left.

The price is 10.50 GB Pounds per pair, and postage and packing to
the US would be 5.00 GB Pounds (Air Mail), for total 15.50 GB Pounds.
(Postage within UK is 2.00 GB Pounds second class).

I inherited these with the rubber cloth and tube stock when I took
over this business last year, so I don't know whether I can get more,
but they aren't called for often.  For other items I stock for player
piano and other restorations, check out http://www.musicanic.com/

John Farmer
UK