If it were me all over again I'd go with new OEM globes from Amayama.
I've had my KJS500 for almost 2 years now, don't have any objective complaints other than fronts didn't fit in without removing a bracket temporarily iirc. (Problem is there's no 100% clearcut way I know of to validate how 'well' the system is working and if there are issues is it due to some imbalance in the size/pressure of the globes or something else in the suspension/electronics at play but that's a whole different topic).
At the time, I wasn't interested in B&B for a number of reasons, Pleiades was near impossible to reach/buy from online or via email, and the price for KJS500 ($800 iirc for 4) made it worth the risk for me to give 'em a shot.
Now things have changed a little. It looks like KJS500's price is $950 for four, and Amayama looks like a legit source for OEM at the cheapest possible price! As a matter of fact, I just ordered a few hundred worth of parts (tilt and telescoping motor and other misc.) from Amayama but haven't received the parts yet. I can't vouch firsthand yet, but it looks like hkeller vouches for them, I've seen others on other forums talk about them, and they do seem legit. If I were looking for globes all over again now, I'd try Amayama for sure.
--- tangent on Amayama ----
I don't fully understand Amayama's business model - it's weird to me in a few ways:
1) first, each part you want has wildly different prices depending on where it's coming from (never been given that option before), and
2) instead of a single ordering process of picking parts, shipping location and options, and then you order it online in one multi-step process, with Amayama you pick parts and then submit a request. Within a day or two they process the request (tally shipping etc) and create an order in pending payments state. Then you go back in to pay for the order.
3) In my case my single order was broken out into multiple orders and I had to pay separately for each order even though I submitted them together at once. presumably based on where they were shipping from but still different and strange to me.
So it's a little weird but at those prices and given others vouching for them I was willing to give them a shot.