If you’re ok with making your own - iirc the connectors are AMP Junior Power Timer 2 pin, got nice and cheap on eBay
I must make a few extension cables up and post for sale, this is not the first time guys wanted them
Good idea for someone who needs a cable. The ends may be cheap but to be properly assembled the proper crimper should be used.
If someone does not have the crimper and may never use it again better to buy a custom made cable.
Rick