2200TC diff mountings

Hi folks,
I have trawled the forum and found some info, but have a question. My Jan ‘74 parts catalogue lists diff mounts/extension mount for my Nov ‘74 2200TC as part 620089 not the usual 553975. I see on the MGBD website that it lists 553975 as an acceptable replacement to 620089 as latter not available. Does this sound good?
Best wishes
Nige
 
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