Solar panel connector - not MC4

[loanrangiel]

Struggling to find and of these banana crimp fittings for the junction box of the solar panels I fitted to my caravan, nothing suitable at jaycar and can't find anything close on any website.
I tried a male mc4 pin but it's slightly too big.

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[mtv]

Is the banana plug a bog-standard 4mm?

What size do you need for cable entry?

[loanrangiel]

Is the banana plug a bog-standard 4mm?

What size do you need for cable entry?

It does look like a 4mm banana plug but with the extra long shoulder that is about 6mm diameter.

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[VroomVroom]

maybe try Middy's electrical or some other solar supplier