I am looking to add an 18650 extension and larger tailcap to my L2P to balance the size M3 head. My first question is how well does the solarforce 18650 L2 extension match the L2P?

Next I am looking to put a larger/heavier tailcap. I have seen pictures here of L2's with bigger stainless tails but i cant find any. I looked at lighthound but the ones they have dont seem to be much bigger than the one it came with(other than the stainless part sticking out a bit further)

Any ideas?