This may help some people not sure, but i bought some hs33 clamps from selectbikes.com and they sent them with 20mm long bolts. Now this may only be the case with zoo piranah frames, but the bolts dont go into the 4 bolt mounts far enough so it threads about 1-2mm of the 4 bolt mounts so i had to buy 25mm long bolts. As i said it may not help many people but thought i would let you all know.