Just ask Mary, she's where I got mine from, it's got the black strap with red stitching. She's really great with getting you the strap you want, she changed the strap for my Hublot too.
Although, the Tag is a quartz movement, and a cheaper model (most notably, the AR is nonexistent), I have no doubt she could get you a better one.
Go to watch-international.com or email watchinternational@gmail.com with what you want.