Technically speaking, Danny doesn't do shit on the vehicles himself, he's just the owner/face of Kount's Kustoms, but his lead painter Ryan does magic in that paint shop and that hand turned gold leaf/double pinstriping job on that old GM fire truck was absolutely gorgeous.
Kount's Kustoms in Las Vegas did an episode where they restored an old GM fire truck for the Truckee FD and Danny did an absolutely gorgeous, hand painted/leafed double pinstripe job on it.
Well from your post above, it seems all your issues stem from your using your left foot on the throttle pedal. Try using your right foot like everybody else in North America does.😁
Well, if the main issue is the rotted rubber base gaskets, and the lenses and housings are acceptable enough for you to reuse pretty much as-is because you're not going for a 90+ point show truck, but a survivor in really good original condition, then just find a generic set by Signal Stat of...
Population control if there wasn't any birth control available at the time of the act that got her pregnant and also reinforcing Darwin's survival of the fittest, both physically (surviving the accident) and mentally (not getting on the damn thing in the first place) to improve the species!
Gen X? Son, MD20/20, Boone's Farm, TJ Swann and all of those were around LOOONG before you were! I was drinking them (well, only TJ Swann if we/I couldn't get some beer or hard alcohol) when I was in high school back in the mid-1970s! They even predate us Boomers!
Ah, yes, but they were the cheap nectar that made horny teens' dreams come true - or wound up being spewed under high velocity all over their friends' back seat an hour later!
Could also check the Classifieds in Hemmings for NOS. Those are generic, not IH specific, marker lights and were used on lots of commercial vehicles during that time period.