They're incredibly soft, almost too soft for stock as well. Shake the tranny around and you can see it's like Jello! I know the lower brace can be fabbed up, but i don't have access to fabbing tools right now. The B16 Sentra guys found that a similar aftemarket upper brace from like a Focus or something is almost identical to the stock one.
All this time i was convinced i just had worn synchro's, it may be the mounts causing this. BTW the polyurethane i got (PL construction adhesive) takes a really long time to cure. It's been 2 full days and not ready to put in, though i have heard of people waiting a full month before putting them in. The tube says 24 hours for a full cure, and this stuff is intended to be layed down in small beads, let alone 1.5" of the stuff. I'm glad i found it, as this will now be my go-to for heavy duty type jobs.
Some of it was left on a bolt i used to pack it in and this stuff is very hard. You'd literally need to chip it off with a chisel for removal...
If the passenger side motor mount is indeed hydraulic, i wonder if you could cut it out and inject the hollow area with poly. With how much i see that mount deflect with just some moderate tugs of the motor, i am guessing it's a hydraulic mount, either that or retardedly soft rubber by any standards.