I think the Skeets gauges are gone. I had heard that they will repair the old ones, but, aren't selling new ones.
A pity, as not everyone needs or wants a Hosford's set. Hosford's=Very nice, very expensive, and used but once on a new gun.
If, by chance, you discover an option that costs about what a Skeet's did, post it here. I have access to a 12/16 Skeet's, would like to own a 20/28 set.

Best,
Ted