trying to find a new gas cap

as above im making a cafe racer out of my kz750 82.
but have put and older style tank on it like this

cgi.ebay.co.uk/KAWASAKI-Z650-T-REG-1979-...&hash=item231238e24d

im really struggling to find a replacement gas cap for it as it didnt come with one on it.
have heard it might be a csr tank?
any help you can provide gratefully recieved!
Thanks
Mark.

ok so after going through 24 pages of kwak gas caps i found this

cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem...geName=STRK:MEWAX:IT

do we think this is the right one?

and does anyone have a couple of spare keys as it says any key will open it?
thanks
Mark.

If you know the year and model of the bike the tank you have came off of then just look for that one, as for the one you're looking at it might work but then again I really didn't get a good feel for what tank you actually have. The key hole must be one of those kind where anything you stick in it will turn it, just you your ignition key.

thats the thing i have no idea what year or bike it came off otherwise i would just go and buy one for that year
ill post a pic of the tank in a bit.
have no ignition key didnt get one with the bike as it was a project.


edit, pics of tank

Unfortunately I can't identify your tank either, give this post some time and maybe one fo the other members will know what it is from and post a reply.

ok Ta , so can anyone else help?
he has only got one of those gas caps left so if its the right one ill get it asap.
Cheers Mark.

78-79 KZ650D AKA KZ650SR

51048-1001 CAP ASSY,TANK

So, I'd say the cap on eBay is indeed the right one.