g4wam

Hi all,
just wondered if any one out there can help with the following query..

the rear brake callipers slider pins on MGF/TF are the same as Rover 800 and the ancillary items are the same as well , but why is the profile of the slider pins different on the same calliper (upper/lower) see attachment .
As they are different in profile what is the correct positioning when fitting into the carrier

Mike