i'm hoping someone can help

i've fitted some polly gearbox mounts today to my fiesta turbo

the origional ford items i took off were quite square in shape and sit in the mount container/carrier well, but the new polly ones i got or more of a rectangular shape and won't sit in the mount container

do i leave the mount container out or possibly cut the mount to get it to sit in the mount container

someone on here must know the answer to this?

paul