I was thinking about your project today, wondering how you were coming along with those broken studs. Looks like you"re making good progress!
I may have a sleeve I can spare if it comes to that. We"d need to verify what size you have in it now to confirm. My spare isn"t perfect but should hone up well enough. You can always put the word out on this site and you might find enough to make up a good set. That"s where I got mine. Then again, check with John Saeli I'd bet he can get you a new set.
I encourage you replace the O-rings in those sleeves since you already have it down that far. Sure would be frustrating to put it back together only to find coolant leaking around them.
Hope to see it up and running soon!