hotpoint bwm12 what bearings do i need?

hi,a all
i have an hotpoint bwm12 intergreated washer. the bearings have gone and i,ve looked on ebay and the bearings are available but theres a 30mm size and 35mm size so dose any of you know wich 1 it is i need or do i need a bearing kit if so could you please tel me which kit i need. any help would be appriciated thank you very much.