As for string sides I would guess a definite No for the big names.
As for Rio cut, there seem to be plenty about - a small selection:
Jasz (Chile):
http://www.ergowear.com/swimwear/?sort=newest
http://www.nu-parr.com/home.php?cat=250
http://www.Buffedbod.com/Mens_swimwear_s/79.htm