1975 125 six days vinyl seat refurbish

[OhioTurvy]

I'm a newbie to the POG.  I found my 75 125 six days in southern california and it has been 10 years in the making.  I've finally started hanging parts on frame and working towards having a running bike sometime in the next few months if all goes well. 

Wondering about any help with restoring the old vinyl seat.  Mine has the Penton / KTM stamp on it and is in decent shape with a small (1/2") circular hole in one spot on the top.  I know I can buy the new seat cover but I'm trying to keep as many parts and pieces as original as possible. 

Any thoughts , ideas, suggestions on what may have worked for any of you would be appreciated. 

OhioTurvy in Santa Cruz California.