I've add the temperature probe extension cables for the AC2, ACPRO, and AC3PRO to the order portion of our website. They are in the probes section. Use TMPEXT for the AC2, and TMPEXTP for the ACPRO or AC3PRO.
BTW, the connectors used for the temp probe on the AC2 is a 2.5mm mono phono jack, and for the Pro it is a 2.5 mm stereo phono jack.
Curt