Measure every thing with either a steel rule or a vernier. Things only have to be 0.3mm + 0.4mm + 0.5mm over size and your 1.2mm out, some times 'that'll do' just don't work.
Compare the crush tube length with the internal bracket size, if it's too short you could put the correct size washer in to make up the difference. If the crush tube is the correct lengh then it's either the tophat of the poly bush is too wide or the steel bush tube is too long and needs trimming back.
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