Yeah, there is some variety in the diameter of both the probe tip and the grounding sleeve, so the adapters are somewhat specific. I have a set of the Cal Test CT2708, and they just barely work with some Rigol probes with a 4.7mm sleeve diameter if you squish the contact leaves a bit. I don't know how consistent the dimensions of Tek probes are, so the OP may need to take some measurements first. Whatever adapters Tek sells, there's a good chance they're available directly from whoever makes them, or under a different brand, at a better price.