t-lock

Is it wise or possible to replace several roof vent's on a house with t-lock shingles? Replacement shingles are not available, and hail damaged vents need replacing. Thanks in advance! Rob

Does anyone know of a source whee I can get bundles of T-lock shingles? I'm a claims supervisor and occasionally only a few shingles are needed for T-lock repair, but I have found dwindling resources for these. Thanks in advance for your help!