OK so I needed new front wheel bearings and ordered aftermarket ones online and after fitting through up a load of fault codes for the abs etc. 

On removing them and measuring them they are only 11mm deep into the hub where the original ones are just over 14mm. I've phoned Subaru for genuine ones and they are £306 each. 😯

I beleive Impreza, Forester and Legacy all use the same bearings. Has anyone else had this issue and where did you get the correct bearings from? 

Thanks. 

Managed to order genuine Subaru ones off ebay from icp for £120 each so here's hoping that they will be correct.