Searching for unique 22-E-50

I have a fair number of double hung wood window sashes built by Bonneville about 10 years ago. The homeowner I got them from is probably part of the reason they went bankrupt. It must of been part of a $40K order that did not fit properly.

I am trying to find balances which I hope to build operable window units with. See attached photo. The set up unit is approx. 55" tall. The only identifying marks I can find are:

(03/5) UNIQUE 22-E-50

I appreciate any help you can offer. If I have success here, I then have some of their French doors that I'll be looking for hinges and locksets.

Thanks,

Mark

Thanks, Paul. I checked that page and did not see an option foe 23E. There are just options A through D listed.

Also, what is return policy? if I order 4 for a trial setup are 3 unopened ones returnable if the first try doesn't work out?

Mortice mechanism in my Bonneville French door is broken, and I'd like to replace this unit in two doors.