Well now i have two possible solutions for the retracts, one is electrical and the other one is air. Take a look a this two sets of retracts: http://shop.lindinger.at/product_inf...ducts_id=79143 this is the air ones and this are the electrical http://shop.lindinger.at/product_inf...ducts_id=91358.
The price i have to say that both are very nice deals the air retracts cost something like USD50 !!!! yes 5 0 dollars!