I want to buy a black official rubber strap with deployment clasp for my PO Cal 8900.
Lug size 21mm. + deployment clasp 18mm.

 

if you want pre owned check here. They come up from time to time at a good price. You also might want to call an AD on the strap price. I bought a blue strap for 230 and I thought that was fair. Worst part a couple months later I saw one pre owned in mint condition for 125.