Heres a reply from RC Disco
"when you cut/remove the rear part under the rear gearbox mate. If you then use the +2mm hangers - it re-positions the rear wishbones in the same place as they were before (ie with the 'insert' in place under the gearbox). It does however move the rear top link in relationship to the wishbones (moved them 2mm close together) - which gives you a bit more rear grip / less steering"
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