I have done this a while ago, however, I think it will help somebody who has a seat with some damaged leather.
The driver seat from this 944 was a little damaged at the side section, and I need to repair it. I switched the back section from the right seat to the driver seat. So when I'm done with the repaired area it will be on the inner side and should not be worn so easy.
Here is how I did it.
First I cut away all the thin worn pieces around the big hole, and sanded the leather a bit.
I used a piece of leather, and sanded down the edge all around.
Insert the piece, and glued it in with some trim contact glue.
I also did a small piece for the small hole.
Then I use a few layers of Viper Duraflex.
Sanded it smooth, ready for dye.
Here after applying the leather dye. I got the dye from Leatherword, and the brown came with an color adjustment kit.
I hope this can help if somebody else has the same situation.
I sold the car last year, and as far as I know it's holding up pretty good.
Cheers
Engelbert