This is the carnage that awaited me when I disassembled the front forks:
And here are the cheapie plastic turn signals I bought to replace the bent and busted originals. Unfortunately, I discovered that they use T5 wedge-base bulbs. The brightest 6V bulbs they make to fit are 9 watt/12 candlepower, only 50-60% as bright as the originals. Oh well, at only $1.49 each, including shipping from Guangzhou, it’s no big deal to throw them in a box for another project down the line.