Mesa 7I97 for bipolar analog control

Hello everyone
I tried to get a 7I97 Mesa's board since 2021 
but never is in stock on webstore, i sent a couple of mails to contact at a seller unfourtunedly never got success, 
​​​I would like to retrofiting a machine with analog -/+10V servo controls
do You know if is possible to get a board? Or are there another alternative option to implement a similar linuxcnc retrofit ?
Thanks in advance

A 7I83 +7I96 +7I85 or ior 7I95T + 7I83 are possibilities

Also we should have first 7I97Ts in a week or two

Amazing !!
I noticed there are many mesa board sites.
Which is the oficial one?
Thanks thanks for you reply

Official website is www.mesanet.com and officially PCW is the grand master of Mesa.