Until the Verto/injection type cars most minis had a small inspection hole for checking timing at the top of the clutch housing. These 1/4"unf bolts 1/2" long hold on that plate but you can use shorter type
SH604031 also.
Also used for some metal fans to waterpump
For plastic fan and later water pump Pulley to waterpump use
GFK5179 1/4""unf 3/4"long.