Camera repair shops often have boxes of spare bits or old cameras they keep for spare parts. Visit them and enquire. Won't hurt.
Or you could try this gentleman, he may be able to assist you.
http://www.manfredschmidt.com/
An interesting web site. I bought a few things from him quite some time ago. Courteous, prompt posting, excellent service overall.
I own two Rolleiflex Ts, black models. Wonderful cameras with superb lenses. Forget the crap some posters spout about weak shutter links, if handled with care they are built like Sherman tanks and just go on and on and on.
Ask about the T 16 exposure kit as well. A must have accessory. Also a lens hood, if you don't already have one. Maybe a UVor H1 filter to protect the taking lens. Your T kit will then be complete.