some clamped from behind like the ebay link, some had a flat snap ring to hold in the mesh and some have a special zig/zag wire thats holds in the mesh, in all the debate over these I have never seen a proven time line for the changes, my best guess is there was two suppliers of these to the market the clamp style they have there own look to them and I think they dont have a breather tube, "Vern is yours Tube delete"? and the style with the snap-ring or wire holders they appear to be the same unit just a change in holding down the mesh and they have a breather tube.
who knows??? bottom line there hard to find these days as most went in the trash after a backfire and it puked molten goo down a guys carb.
