Freelander commercial

Hi, this is my first post, I have what might be a difficult question. Just bought a Freelander commercial van, really like it. Replaced the VCU as a matter of rote as I didnt know its history. The rear diff bangs around a lot, centre mount is new rear mounts look OK except there is about 1" clearance between the rubber buffers and the cross-member. looking on You-tube and google images would appear that the rubber buffers should be in close contact. Dont know if its standard on all vans, but mine appears to be on stilts, seems to be about 2" higher than normal. Is it possible I need rear diff mounts with bigger buffers on them? Have wedged 1" thick high density foam packing in the gap and all seems well.