New parts are available and not that expensive. While the LENS from a couple other Hondas are the same, the mount hardware is not a perfect match, and requires some hand fitting if used in the interstate fender cutout. Info is a few years old and parts prices may have increased a bit.
Honda standard/tourer taillight 33701-MZO-67117
RUBBER boot
80122-MZ0-000 001 $5.67
01 COLLAR
17216-HA7-670 002 $3.40
21 RUBBER washer
80219-KCZ-000 002 $2.50
23 BOLT, FLANGE (5X25)
90112-GG2-900 002 $2.50
Maybe the wiring harnesses for the Tourer.
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Taken from another's post.
I bought all of the parts I needed new from Honda Direct Line OEM parts section:
http://www.hondaonlineparts.com/ I'm too impatient to try short cuts or wait for a deal to come along.
33701-MZ0-671 tail light assembly $110.65
80122-MZ0-000 rubber $5.67
32102-MZ0-000 wiring sub-assembly $5.52
32103-MZ0-000 wiring sub-assembly $8.86
I used the wiring harness sub-assemblies from a Standard and they tied right in to the Interstate system (except for one wire) without cutting anything. For the one wire, I just connected it and taped it to the standing part of the I/S wiring harness because I did not want to alter the original I/S harness. I could have made a better connection if I didn't mind cutting the original harness.