Hi Dal,
Thanks for getting in touch about the wheels...
The 7J rims you've been offered are not suitable for you! 7J (with an ET of 23) will be too wide and you'll struggle to get them under the arches (even at the rear).
You will need to get 6J rims - these have an ET of 36 which is the same as 6J Porsche Teledials and 6J Fuchs. You will need adaptors so you can go from 5x112 PCD to 5x130 - if your adaptors are 2cm thick (or maybe a little more) then you'll be fine and they'll sit under the arches nicely!
Adaptors can be bought from loads of places but the cheapest/quality option is on eBay - you can get a set of four with Porsche bolts and lockers for £145 Buy It Now on eBay...
http://cgi.ebay.co.uk/VW-to-Porsche-adptr-pltes-bolts-lockers-T2-T25-CAMPER_W0QQitemZ170141992360QQihZ007QQcategoryZ27385QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
- although occasionally 2nd hand sets come up for sale (they usually go for £100ish anyway) so worth keeping an eye out.
The trouble you may have is finding a set of 6J rims for sale - they are much, much rarer than 7J as they were only fitted to early 911's and some 944's (front only) and are often sought after for historic racing/rallying where rim width is limited to 6 inches - but don't loose heart as they are out there! In fact, there appears to be a set on eBay at the moment - the ad doesn't say that they're 6J but it looks like it to me from the photo - why not ask the seller...
http://cgi.ebay.co.uk/porsche-cookie-cutters-good-tyres-bargain_W0QQitemZ290154908325QQihZ019QQcategoryZ9888QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Combiporsche's bus uses home-made 2cm thick adaptors and 6J rims and I think it looks just right - you'll struggle to find adaptors quite that thin but a few extra mm won't matter much!
If there's anything else you need help with just drop me a line or call me on 07774 413652 (not too late though as I get up early!!!).
Good luck with your search...
Juss