FLM03 50A current clamp compatible with Flukso V2a

Hi,
I bought Flukso V2a a few years ago and its still doing its works very good with the 2 impulse meters.
I would like to buy current clamps for the flukso however the current ones on shop are not compatible with older versions of flukso.
Why?
The older ones are not for sale in the shop can i use other kind of current clamps or is specific to flukso clamps?
Is it possible to make compatibility with FLM03 since people dont have any option for their devices?

Regards,
Anselmo
Portugal