Door closer straps

I'm looking for a supplier of door closer straps.
Rather than pull the 40 door shut by the door box I have seen pull closers.
There's a nice closer used on GTA Alfa Romeo's but it's and arm and a leg @ £ 250
Has anyone seen these about ???
Cheers

 

[David]

Have you got a picture of the Alfa's closer?

 

[EGLITOM]

Dear Keith

i did use a red dog lace and cut it up. Looks similar to Porsche RS ones.
Which you can buy here:
TRVERKLEIDUNG

Porsche 911 964 993 RS Türschlaufen Türöffner Universal | eBay

 

Picture of Alfa closer
It's sprung loaded so after pulling it returns back to flat shape
" Excuse the Pun "