Hi Tim (Flemke)
Both pieces will add weight to your setup over the Carbon Fiber.
(probably not recommended if someone is mounting an ET2 on a Linn LP12)
You will be tempted to add the joint (Gooseneck) first (quicker to do), but to do proper "audiophile" observations for us, you should replace the mount first since it cradles "the whole enchilada". Then the Gooseneck 2nd. Doing two changes at the same time in ones system, breaks multiple audiophile rules.
But then again, if you are like me right now, just trying to make it past what is remaining of winter with some music; the last thing on your mind, may be to want to mess with your set up.
I have the new mount and what I consider a third party aluminum Goosneck, which I acquired if you remember my posts here, by way of New Zealand, courtesy of Richard Krebs.
My shiny Gooseneck, was IMO, a sort of inspiration for Bruce to do the Aluminum. I remember he really liked what he saw in the picture of what I sent to him. Mine is a bright silver and it does add bling to the setup if one likes that. I prefer that Bruce kept his aluminum pieces the same color as the rest of the tonearm parts.
Then again,
I read here on AudioGon somewhere, that someone once posted a question; Why do all these air bearing linear trackers need to look like oil pumping rigs ? He was obviously a bling fan.