Am I missing something?

Hi, being a new member of this forum, I certainly have questions, for which I still have not found answers. One of them is - what happened to 21mm Omega straps? I purchased both my Omegas on bracelets, but want to have straps for them too. For the Moon Phase Speedmaster, I found an almost new leather BSOM strap on ebay, so problem solved. On the other hand, finding a black/orange 21/18 mm strap for my PO is almost impossible. The Omega store does not sell those. There are many chinese sellers out there, but when I tried one (yes, I was that desperate 😉 ), the strap appeared to be a total crap, with the clasp lacking the finesse, but most importantly, that strap had a wrong position for the pin, so the pin did not fit the holes in the lugs. Couple scratches later, I threw it in the trash. Would appreciate any hint about how I could get a strap for my PO. Thank you. Cheers!

Thank you, will try. Did not know that AD can get me what is not available online. Cheers!