Here is the response from Beech Tech Support on the window trim for M1313. None show up as being available in RAPID. If I turn up any errors in the numbers, I'll update this post. I am a bit suspicious about the numbers, for a couple of reasons, and have asked for a re-check.
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Mike, you are correct about the IPC; it seems to jump over M-1313. However, by going to the actual upholstery installation drawing 169-530004-9 for this serial number aircraft, it appears that the cabin door moldings are P/N 169-534072-8 and 169-534072-9. The side-wall molding from fuselage station 132.0 to 181.0 is P/N 169-534062-13 and 169-534062-14.
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FOLLOW-UP ON FEBRUARY 13
I have received some drawing data that seems to partially support the above-listed part numbers. However, I still think that they are in error (or have been superseded, or both). All of the 1970 and later C23s I have seen have all had the small LH baggage door. All have had a one-piece window trim aft of the cabin doors, on both LH and RH sides. The 169-534062 part number prefix only shows up in one place in the IPCs, for a Sierra. If I owned a 1970 or later C23, I would first try using the Vantage Plane Plastics (formerly Kinzie) trim for both sides. It is available at planeplastics.com. Their part numbers are:
K169-534092-13 (LH, about $235)
K169-534092-14 (RH, about $206)