When I fitted Bantam gaiters I made a hole in the lower rear of them by heating up a rod to burn a hole in them. This lets the water out and the air in and out, so that they don't collapse. A discreet twist of copper wire fixed them in place.
I found that they were a good thing for a solo but if used on the sidecar setting of the forks they were squashed against the fork blade. They will give you a longer life to the spring boxes as you can lubricate them well and they keep out road grit.