This bolt goes through the spacer on lower radiator mount on cars from 1974 onwards with a one piece cowl.
5/16 bolt 3.2502 long with small amount of 1" thread at end.
Recommend: 1 x 12G4270 per Mini.
For single cowl lower radiator bracket, see 12A2153
For the spacer tube, see ARP1073
For the grommets, see CAM4618