SPEARS union for MRC reactors

[Z06-Hec]

Wow....
I bought an MRC FMC 620 from here a while back. It came with the hard plumbed 3/4 pvc into a Spears brand 3/4 union. Only thing is I only got the male side with no gasket slot/notch. So I am missing the other end with the gasket for both elbows.
Initially I was able to hold a gasket in place and mate it to the white home depot brand but the gasket doesn't not stay in place so it leaks.
I have ordered these unions from PVC Fittings online, Zooming, 3 local "plumbing stores" thst all claimed to carry SPEARS. All of these places did not have spears and their union did not mate, nut too big and doesn't grip the thread and also same gasket problem.
Looked them up, SPEARS... they are 40 mins from me but do not sell to public only to stores. All the local stores that they claim should have it don't.
Just ordered this again from Black hawk supply.... telling me it won't arrive until Nov 16th.
This is nuts, literally. Been buying and returning for weeks, everyone claiming its the same and will mate or this and that.... waste of time.

 

[X-37B]

Check ebay. A Spears ball valve end may work.
There are plenty of Spear unions also.