Does anyone know where to get the cruise control diaphragm for an 88 90 4cyl? Please, i'll be taking a long drive in the next month and want the CC to be working.

Thanks

Check online stores, I use maximumautoparts.com and rockauto.com
Otherway, is to try to make your own, or fix with tape.
I should find a leak as well on my car. It just doesnt work.

Does the CC vacuum diaphragm unit have any official name that anyone knows of??

try auto2.ru, its has a etka catalog online, you can find the part number there.

How would one translate the page?

did it for you,
throttle control element,
regular, 893907327
automatic 811907326
Diesel N 0110088
it shows to be a unit.
It was in Electirick page>CRUISE CONTROL SYSTEM
for me if I need to get back