I'm pretty sure the Fostex parts I got came from the Fostex Pro Monitor speakers -
they even came with the upright mounts for time aligning the drivers.
The Mid horn driver has a Lab Series D252 label. The round nose super tweeters I got
don't have a label but looks identical to the T825 tweeter I've seen in their catalogs.
Here is a clean copy of just the crossover drawing I got ...
Again, this is a hybrid design for bridging a JBL 2214 woofer to the
Fostex Pro Monitor tweeter and Fostex mid horn pair.