You can use 86343 per this info...
Technical Reference: Alcor Master Drawing List for STC 522SW, Revision 62 Dated November 17th, 2022 which references drawing revision date 8/25/2019.
Previously used Part Numbers
86316
86317
86339
Intended for use with Type K EGT or TIT instruments and leads
Clamp fits 1 1/8 to 3 1/4 diameter exhaust systems with approximately .1285 size hole
Accurate to ± 25 degrees at 1500 degrees Fahrenheit
PMA and FAA approved for all reciprocating powered aircraft
Alcor probes are designed, manufactured, and supported in the U.S.A.