Welcome to the forum!!
Might check with the store on this site for a shaft log / stern bearing
Hunter 460-466 shaft log / stern bearing (hunterowners.com). Get a caliper from any hardware store and measure the OD of the stern tube. I understand Hunter 466 used 2 different sizes on my model with a 1/8" difference as discussed in post #2 in this thread
stern tube diameter. It will save you from buying the wrong size which may be different from your manual below
Hunter_460_25763937.pdf (sailboatowners.com) page 56A. A caliper costs $10 and well worth it. According the thread, taking the flange of is the big problem when installing the shaft seat, use bolts with a socket between the shaft and the tranny flange but be careful not to over tighten, spray some liquid wrench or equivalent in first and let it sit a day or so and make sure to clean the shaft well before installing. PSS instructions are reportedly fool proof.