Guys,
Just to let you know the branch of hobby centre in airport road is still there, its just in the building on the right of the old one - the entrance is down the second alley of the building on the right.....there are some little signs to direct you from the old shop.... but here is map to show it better..

The main parts centre in Al Quoz now (and is not accessible to the public) they recommend calling up either branch and letting them know what parts you are looking for, they will then get them from the warehouse (if they have it) and drop them at either store for you to collect....
Phone Numbers:
Dubai Mall - 04 330 8355
Deira Showroom - 04 294 6647