Nep, they are not interchangeable with our current stock, these work in panels up to 1" but are not the IL long barrel we currently have in stock. We will have more options in the future.
Will the mag-stik plus hollow shafts be available in "regular" and "long" lengths or just the standard length? Just wondering, since the ones they come with are a bit stubby and I'm planning to mount mine from the bottom of a 3/4" panel. A little extra length would be awesome.
Whatever the answer to that is, please earmark two of the mag-stik shafts, two RGB leds and two balltops for me if supplies are indeed limited. Are the slip ring assemblies considered a must for this? I plan on picking up some translucent buttons from you too, just waiting to place a single order so I can snag the free shipping.... 
That button in your last picture, is that an IL/Happ style button? Can't see the threads or microswitch.
Thanks!
I can measure the tops but these are based on the longer Ultimarc ball top shafts. I only have about 20 of the Mag Stik shafts and they were not cheap so final price on those will probably be a little more than the others at about 20 each, plus led, ball top, etc. They are stainless, but between the low quantity and massive amount of material, these cost me twice what the other shafts did. If they sell out quickly I will restock them. However it's a bit silly to stock shafts for a stick only someone else carries....
As far as the buttons go, these are not "IL/Happ style".... They are true IL buttons, from the factory molds. Again crappy cell phone picture for now, but IL really set the standard in arcade control quality so we wanted to work with them specifically on producing these buttons