PS Reservoir

[DavidT]

While I was in the middle of a brake job, I borrowed a caliper to measure the pulley. From edge to edge, I read 2.47 inches.
Anyone know the answer?

EDIT:
The internet is a GREAT tool 62.7mm

 

[SHOZ123]

2.47"/25.4(mm per")=62.7mm. Close to 59 mm seeing as the pulley should be measured at the ribs.