I'm concerned that by replying here I'll be accused of thread mining.. But given this thread is less than 2 years old I'm going to call is thread dusting, maybe even thread scraping.
Anyways I've seen this question pop up every now and then and there don't seem to be many direct answers. So hopefully this info assists any travellers from the planet Melmac in the future.
I'm sure this info is good for all BA, BF, SX and SY upto 2008, maybe 2009. And its in relation to the PBR part numbers to make it easier to ID in the aftermarket and wrecker yard.
BA and BF vehicles with
ABS/TCS ONLY used PBR booster B259-041 and PBR master cylinder B227-109. At some stage BF went to PBR booster B259-058.
The same B259-041/058 and B227-109 brake combination was used on all cars from the most lowly XT to the most expensive FPV with 6/4 Brembo calipers.
BF vehicles with Stability Control/DSC (whatever you want to call it) used PBR booster B259-060 and master cylinder B227-114.
Couple of very distinct external differences between the 2 combinations.
The metal pipes on B227-109 are different sizes. The pipe closest to the booster is about half the size of the other one. That nut is M10 and the other nut M12.
The metal pipes on B227-114 are both the same thick size, both M12 nuts.
Booster B259-041 and B259-058 are identical externally.
Booster B259-060 is, as far as I know, identical to B259-058 internally and the only external difference is the B259-060 front push rod is shorter. By about 10 or so mm.
The bore in the piston of MC B224-114 is much shallower than B224-109.
You can swap the rods around between the 2 and as a combination they will work. Otherwise they won't.
Same applies for the relevant SX/SY vehicles up until those years.
Much of it was pointed out in the first post, but thought it would be good to put part numbers to the descriptions.