Not sure what tranny you had in the 65 limo, but I have a 64 limo drive shaft. The 65 was effectively the same car, body wise. Not sure on the engine.
As noted on our Driveshaft Help page at
the 1965 75 series front drive shaft section is longer than the 1964 75 series front driveshaft section since it used the shorter Turbo Hydramatic in 1965 75 series body styles. I have parted out one 1965 75 series and had that super long 75 series front section and still have it.
Looking at the picture below the 1964 75 series front section is approx. 45 1/8" tip to tip, while the 1965 75 series front section is 2" longer at approx. 47 1/8" tip to tip.
If interested the 1965 front section is for sale for $75 + s/h. Email me at firstname.lastname@example.org if you think this is something you need. I also have 3 1964 75 series front section but sounds like Russ has that item if you need it.
Here is the picture:
Shorty, Me, Russ and a few others sell parts on the side and am always glad to help out when I have something. I saw this message thread and thought I better pop in as I've had this front section for some time and knew it was longer than the 64 version. Anyway, just shoot me and email when ready. The thing about an item like this is there is not a huge demand for them, but the for the few that need them they are hard to find.