Noirot Heater replacement castor clip

I've created this part for a client as a replacement to the clips that hold the castors in place on a Noirot heater.
Only 2 clips were originally supplied (1 for each castor set) with no spares, and no google search helped them.
This was measured from the broken part and clips straight on.
ABS recommended for this part so as to not be too brittle.