If they are anything like back in my days of getting the Stew-Mac catalogs on a regular basis, it's very most likely the "mini" sized schallers. The Full Size IIRC were for Gibson 3X3 tuning machines.
What you will want to swap your Jaguar to Schallers will be the following...
- a six on a side right handed (non-reverse headstock) set of Schaller Tuning Keys, such as the M6 Mini
- In most cases (except maybe the KC Jaguars) you will need to re-drill the holes for the pegs wider for them to fit as most Scahllers I've seen use that screw-down post nut.
