I did mine this week, couldn't get the pens described in previous threads here in the UK but sourced a set of pens made by Dylon like these but about $10 over here for the set (
http://www.amazon.com/Dylon-DYE-101A...ylon+fine+pens)
One pen just managed to do the interior but ~I didnt do the doors , I did 3-4" and then wiped it over with a damp microfibre
My wheel was already stitched in red making it much more noticeable that the other stitching didnt match