channel master 1.2

hello all

i receive a used channel master 1.2 but the polar mount needs restore.
i have read already the kind off bearings i need and she dont have the feed horn cm.
first question is can i use a gilbertine i have or do i need the real feed horn.
second question the bearings i have dont pass all polar mount. i can put it on the holls but pass all trought.
this is normal on the real ones?