Surly Pugsley bottom bracket replacement Does the bottom bracket on Surly Pugsley need to be replaced with a like for like  surly part (100mm external bottom bracket) or will any 100mm external bottom bracket be compatible..?

The surly part is quite expensive compared to some other brands, but I can't be certain that they are compatible with the Surly O.D. crank.

First time doing this job, apologise for any ignorance.

Appreciate any insight.
Surly O.D cranks have a standard (for threaded external BB bearings) 24mm spindle diameter, and the outboard bearing units seem to be standard width (unlike the extra wide Surly Moonlander specific variant. I think you are safe with a non Surly 100mm BB.