Try checking in the tikka barrel swap thread to see if anyone listed they have those ones (not really as popular of a caliber here).
If you want to buy some new your bang for the buck might be clymer gauges from brownells, the individual ones are $33ea (cheaper buying individual if you want both vs the set for some reason) and 15% off right now, plus if getting both gauges (or something else) you cross into free shipping territory.