Dizzy cap clip for a Renault 5

Like a Wally I opened my dizzy cap to change the rotor arm and one of the clips pinged off straight down a drain!

I have bodged it closed with a cable tie, but in the rain I believe water gets in and the car cuts out and won't start again, which isn't ideal.

I've tried eBay, but not found anything, don't know where else to look.

Any help appreciated. Oh it's a 1990 super 5 1.4 automatic C2J engine.

Thanks muchly.