You will like the larger spikes with the exterior chain catcher, it is a game changer with keeping the saw from tipping over so the bar nose and chain doesn't hit the ground especially running with a longer bar. This set of spikes allows my 400 with a 25" bar to sit on the ground, concrete, etc rock solid.
Here are the Stihl spikes I run on my saws and they are a matched pair and made for the 440 to 661.
Stihl put a threaded nut on the inner spike top hole to eliminate the nut that required a wrench if you wanted to remove the inner spike for any reason.
Part Numbers are:
Inner: 1144 660 0802
Outer: 1144 664 0504
These spikes will also fit the 362 and 400 with slight modification using a die grinder to the bottom of the spike for chassis interference and slight elongation to the bolt holes on the outer spike, photo of the 362 and 400 with same spikes. Pic added for size comparison since they look small not on the saw.