I know this doesn't 'help' as such, but in general over the years, I've rebuilt a lot of gearboxes (mostly aussie m20/21 and believe it or not mini a-series boxes especially) Both of those have had at different times 'non genuine' synchros (or baulk rings) and I can only tell you that from my experience with them (and the costly failures as they alternately snapped right through or wore down like I had replaced the gearbox oil with valve grinding paste) - I truly reckon it's one place not to try and save money. I've never heard a bad word about the nissan items (you can certainly get most of the bearings elsewhere) and I must confess I haven't rebuilt a nissan 60 series specifically either, so take the comments on that basis.

One of the reasons I rebuilt a bunch of mini gearboxes (for my own projects and for a bunch of friends, and then some people through word of mouth) was because a particular mini specialist was advertising 'reco' gearboxes cheaper (as a changeover) than I could purchase the required parts that I considered to be the 'bare minimum' required. Then it turns out most of them barely last beyond 2-3 months. I started doing all my own auto boxes for similar reasons.

sometimes there's just no avoiding certain costs. Mind you if anyone has a source of aftermarket synchro's and has personal experience with them and can attest to their quality and longevity, I'm all ears.

I'd also (based on experience) shy away from using 'used' synchros even if they managed to pass muster as far as size/gap goes (someone will know what I am talking about here, I don't know the correct term)

I will say this - some of the mini gearboxes I did lasted beyond the life of the motors (and I made the motors last a long time too, by mini standards) and I can honestly say I've never regretted having to delay a rebuild till I had sufficient funds to do it right. I've seen _way_ to many shortcuts ending up not being a shortcut, unless you count 'short cut to untold misery'. Sometimes we just have to bite the bullet.

I'll tell you what though, if you can get any price break on the synchros by buying 10 of them (or some similar number) PM me, and I'll go in a group buy - you grab the two you need, I'll grab the rest - up to 10 of them for me, if it needs to be that high, or I'll go 5 if). I will use a set sooner or later, so they won't go to waste!