i have a 94 Disco and both front seat have seen the stitching come apart. Where can I find either new skins or covers. i had bought OEM covers but didnt fit my headrest. thanks for your help.

 

You will have to do a Google search for them.
If you have the built in headrests (non removable) you will have a hard time finding them.

Have you tried looking for new seats?
www.autosportsunlimited.com
www.roverlandparts.com

Any DI seat will fit as long as it has the same adjustments.
So any DI power seat will bolt right in if you have power seats and any manual seat will bolt right in if you have manual seats.