If you are gonna do it yourself heres a little tip for you amateurs..lol
Cut everything perfectly along all seems.
Stick material straight over the top of the existing seat covers.
Cut exactly around.
Sew them back up exactly how they came apart using strike marks which are little nicks in the edges of the material..These ALL have to line up..
Keep on cover intact so that you can use it for reference.
If need be number the panels..eg - AA,BB etc so that you know which ones go next to each other..
And make sure you put TOP and BOTTOM!
Good luck and one more tip....
Our phone number is 02380 260045 and we come highly recommended! LOL
Ffion