Hi Does anyone know the make/type and  sizes of the main bearings  for my Beta 80 rev it's a 2006, I know I can get them from beta uk but looking to buy direct from a bearing company

also the crank seals sizes

thanks in advance

Parts book dosn't say make of main bearing,but i would have thought any good make should do.

Suggest you take them off and show them to your Bearing Shop, they will measure them Ok.  Nearly all are metric these days, and go in even number of mm sizes.   These shops mostly deal with ball-races now.    When I wanted 120 individual 3/8th ball-bearings, they had to get them in by special order.