Unless your Cruiser has been altered, as far as I know, you should only have to:
- install a DRL system
- replace headlamps with LHD style
- replace front corner marker lamps with yellow bulbs
- replace tires if no DOT marker
As far as I know, all of the glass and other lights are DOT.
Whether the taillights meet the rear, red, side reflector requirement or not seems to be interpretted inconsistently. Pretty easy to glue a DOT red reflector in the same location as the US market marker light. Don't give them an easy way to fail your Cruiser.
For headlamps, you have two choices: US market, or european market e-codes. Your JDM will have the wiring for the e-codes, but you would have to adapt it to work with the US headlamps. Expect to spend $300-400 to replace the headlamps with new e-codes.
Some sources that may have them:
EBI
RADD Cruisers
Rocky Mountain Imports
ATEB
Silk Road Autos
I got mine from ATEB. EBI is a MUD vendor. RADD Cruisers and Rocky Mountain are local.
The e-codes are considered by some (many? most?) to be better than the US market lamps.
You should source your big end bearings (BEBs) now and plan on installing ASAP. Do NOT procrastinate on this!
-Steve