I believe Harley offered a custom chopper and only high volume dealerships were granted the ability to sell them to the public. The chopper was called ThunderMountain. The whole bike was 98% harley, the only item not a harley part was the custom paint job. The choppers came with the 103 motor.
the little detail that the dealer left out is the owner can only get the thundermountain serviced at dealerships that sell the thundermountain. This may have changed over the years but I ended up with a 85 mile ride just to get it to an approved dealer. I actually went to local dealers and they said no way are we working on that, they said their lifts were not long enough. I had mine for 2 years and was glad to get rid of it the chopper did not hold up as well as regular harleys do.
my .02 cents.