Mini Racer 95,
3Racing do a ball diff, you would be advised to stay away from it. Tech racing do a spool that fits inside the Tamiya gear diff. A Tamiya gear diff or ball diff can be made into a spool. Just need some superglue in a gear diff or pin/glue/screw a ball diff. The updated 3Racing ball diffs for the MO5 have not been released so no comment on there new products. Old one was a dog..
Later,
Calvin.