How much do I ask for?! £££

I've just sold my beloved Mk1 GTi project and the interior was going to be sold separately, however the chap I have sold it to has expressed an interest in buying that too…….the problem is that i have no idea how much to offer it for??!

It will consist of:

- Front and rear GTi seats in green stripe and in great condition
- Set of door and rear cards
- Full set of seat belts and fixings

Any suggestions of what I should be asking for it all??

Cheers folks

ps moderators; if this is in the wrong place please move, thanks

What condition is it in and show us some pictures of it if you can!  

Good interiors are getting harder and harder to find so don't sell it too cheap. Remember you can always come down but can't go up.
I've seen good seats being advertised at £500 but whether they fetch that I'm not sure. They maybe being snapped up! I guess you have to way up how much you would spend getting an average set up to the standard of a good/mint set and the hassle involved.