Where to get special parts to fix my Formula 1 - please help!

Hi All,

I have had a Formula 1 now for 8 years. Its in great shape other than the black cap that covers the pusher which has fallen off. I can actually still use the chronograph properly because I can push the tube with my nail. However, I would like to find the cap to be able to cover it.

If anyone knows where to find it, it would help me a lot! The model is CAH1113.

This one should fit- best to contact the seller just to make sure

http://www.ebay.com.au/itm/TAG-HEUE...689136?hash=item3acd31b170:g:essAAOSwmfhX4qon

Thank you! I'll contact the guy now. That looks like the perfect part, thank you for your help.