Go to the website http://www.vw-classicparts.com/" onclick="window.open(this.href);return false;
Click Availability check on the right
In new window click access without prior registration
Search for part number (ie 253801252)
If the part is still on file the search will list the part you want with a price in euros and a colour coding
Green = Available
Yellow = Limited availability
Blue = Available shortly
Red = No longer available (usually part is not found on searching)
Select the quantity you require and add to cart
Then click E D I T shopping cart, then click continue
Fill in the availability request form fully including an email address
VW Classic parts will then reply via email with a price quote including shipping
You can then either reply with your credit card details (safer than debit cards imo) or ring them direct to order if your brave. I'm sure they speak sufficient English given the replies I have got from them in the past.
I bought an o/s inner sill from them which worked out the same price as a n/s sill from the UK even with shipping.
)..................cheers! 
T4 Karmann Colorado