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On an '84, I believe the monovalve is electronically activated (my '85 is). One option is to find one in the junkyard, even if the diaphragm is torn. You can use the diaphragm from the rebuild kit you bought on the junkyard one. I haven't found markings on any of the (several) that I have sourced, but I believe that the aftermarket part has a higher polished solenoid housing, while the original Bosch ones are more of a matte finish. You might grab several if there are multiple donors at the junkyard, I've had to swap between a couple different ones until I found one that (seems to) work well.
Another option is to contact George Murphy from this forum, he may have some rebuilt units available.
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