Many thanks - it certainly looks like it's the Friendship II, and the painting on the sidecar on that first image seems to match that from the film perfectly! After searching around a bit the earliest year I've found for Friendship II is 1983 - the design certainly looks 1980s to me - which means the film I'm looking for was probably made between the early 1980s and 1992/3.

Maybe you can update the info @ https://www.imcdb.org/vehicle_444721-Harley-Davidson-Electra-Glide.html with the new better still above and the California Friendship II sidecar info?