I believe those may be vintage '65 or '66 Shelby wheels. I'm not sure anyone is currently reproducing them, but if anybody is, Branda would know and probably carry them.
Looks like early Shelby wheels. I know California Mustang has them for sale, but I would guess many other places can get them too. I was going to attach a bad picture of my 67 with those wheels, but can't use the "Manage Attachment" button for whatever reason.
both california mustang and mustangs unlimited have them in their catalog, there $1335 for 4 15x7's and $999.95 for 4 16x8's in california mustang, and $998 for 4 15x7's in mustangs unlimited
If you are looking for the style 2nd Mustang shows in his picture, I have a new set for sale. They are 15x7. They are 68 Shelby wheels, the wheel pic you show are for 66 Shelby.