Looking for a Seat!

#1
I recently just started redoing a Ruttman that I picked up for my step-son, it was in rough shape.
Does anyone have any info on who or where I can get a new seat made for it? Im looking for a seat that is 14" x 8" or whatever length the original seats were.
Thank you in advance

Here is a picture of what it looked like when I got it:
 
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