Ok Baden,
Here is how it works in the US DS... (Incase Bill has not emailed you yet...)
First you send them an email at:
service@playmobilusa.com
You ask for the parts, (20- 30 51 6440 (Ax))
Then you wait for their reply...
Sometimes this takes a while (like a week) or sometimes a few hours...
When they do reply they will tell you if they have the parts you want and how many.
(Usually the answer is no, as many people have said.)
But when the answer is YES!
You can give them your credit card and some other things they will tell you in the email...
Or if you dont like the idea of giving your credit card in an email,
They also give you thier phone number which is:
1 800 351-8697
You can call them (Only after you have the "confirmation email" they sent you)
To order the parts they confirmed that they had.
Dont worry, if they take a while to answer the phone... (Like several day...
)
Your parts will not be taken. They are reserved for you the moment the confirmation email is sent.
So thats how it works, have fun!