An update for anyone that might be interested...
I bought 3 short cones from ArcadeFixIt - can't beat the price ($7/ea and a reasonable shipping fee) - and they appear to be exact replicas of the originals, even made from the same anodized aluminum (black).
For the buttons, I decided that I didn't need lighted buttons as it appears they go for $25 or more EACH. Actually I found NON-lighted buttons selling for that as well. HOWEVER - luckily I came across atarigames.com - they sell a 3 pack of NOS buttons for $25 + a very nominal shipping fee! As I am using these for Missile Command fire buttons, having lighted buttons really isn't worth $75 or more!
NOTE - I have NOT received either of these products yet - I have placed both orders, but not received them yet.
I will update when I have received _and_ installed them and confirm that everything is as advertised - but I have no reason to doubt that will be the case thus far. I'm just thrilled to have found what I needed to round out my multi-game controller so I wanted to share the info!