Polar Scope for GP mount?

[DM]

FLO sells a polar scope for the EQ5 mount (£29):

http://www.firstlightoptics.com/proddetail.php?prod=polarscopeEQ5-3

Does anyone know if this polar scope will also work for a GP mount?

This would be a whole lot cheaper than the Vixen unit (£92 - OO), and the TS polar scope (Euro71): http://www.telescope-service.com/vixen/mounts/vixenmounts.html#dx

which they say is compatible with EQ5 etc.

Anyone else tried this?

Cheers

David