[DaveG28]

I've tried all the arms over time and my none scientific findings have basically been for the arms Jamie mentioned:

Front
51275 = Strongest arm, but when they fail they clean break (eg end of race), and tend to bend the hinge pin with them
54141 = Crack quite easily, but on the plus side tend not to fail completely, so you finish the race! I've also never bent a hinge pin while running them (so far!)
54283 = Don't crack as often as 54141, but like the front 201 arm I have found they bend and twist, so need keeping an eye on as they knock the geometry out!

Rear
51279 = as per 51275
54142 = as per 54141
51449 = per 54283, except I haven't yet found a twisting problem with them. It's also worth noting this arm has a cut out that's required by the 201, which I don't always see on the other rear arm options, so I'd always go for 51449 for the 2wd!!