Hi Christian & James,
The plugs on the dodger look like the plastic ends that fit into the ends of a bicycle handlebar. I was lucky in that my previous owner left a bag of them onboard. Try bringing one into a bike shop and see if they can match one up. I haven't tried this yet but next time I replace them I will paint the top exposed part to block the UV, maybe they will last longer and not get brittle.
Let us know wherever you source them.
Maramu 1989 #261
Still stuck in NYC....