89 mm is the centre to centre spacing for "normal" R31 struts.c.j.dizzle wrote:just checked it was a bit hard as there still in car and didnt want to take wheel off they measure 90mm roughly from middle of bolt to middle of bolt,if it helps they run a big single pot caliper,only thing i havnt done is made a sheer load spacer to adapt them to the b310 steering knuckle but ive never had a problem with it they still bolt in nice and tight