My pads too have lost the pleather.
(One of the most beautiful phones I own)
I always keep a stock of cheap ebay replacement k240/DT880 pads in my cabinet. You need'em quite often when collecting vintage cans. :) They do fit quite well on the DK 830, too.
For info: I used 6mm thick black open cell foam for dampening replacement.
Well, I am going cover all the holes from the otside with duct tape. I do not wish to disassemble them once again.
Thanks for you help, guys, once again!