almost any other airgun with 11mm. or 3/4" scope grooves, and it's my preferred peep sight for Crosman rifles with the grooved top because it just takes up a small area on top of the receiver with nothing overhanging the sides. The Williams 5D-AG low profile is my second choice but part of it does hang over the side of the receiver.
I sorry but I can't really recommend an online vendor though. I order from Pyramyd on rare occasions, but have never ordered sights from them. The only other airgun company I order from is Crosman, normally just from the parts Dept. but I have ordered a couple of their LPA MIM sights before.
Until recently I just bought Williams sights from a local gun shop that just went out of business, or from my cousin who is a gunsmith a few towns over. If I was going to order one myself I'd likely go through Midway, Amazon, or Cheaper Than Dirt.
For the front sights I make my own. I have access to my cousins lathe, and also just picked up my own. I turn out my own muzzle weights (about the same as on the 760 in your link above) and drill and tap them for ether pin posts that I also make myself, or for random, used screw mount ramp or globe front sights that I get from my cousin or at gun shows.
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