Slides are made that will fit most extruded mast tracks but strength may be an issue. Most slides with rings are for attaching a spinnaker pole and the bale is normal to the track. In a vang application, the pull will be 30 degrees or so up, a very unfair strain on the weld. Nonetheless, many smallish boats do just fine with such a rig as the strains of a sail of say 300 square feet are not so extreme.
For the more heavily loaded righ, a more common approach is to utilize one of the slots in the collar around the maststep on the deck, if so made, or to throughbolt a padeye to the deck just abaft the mast and hang the vang there.
G'luck
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