Thank gosh for you guys, I am actually figuring out what I own. My seat spring kits are as swhacked as I am. I swapped parts so the K-model has the factory plate and the V-Twin plunger assembly, while my 1962 has it the other way 'round. I think maybe I had the plunger but not the plate or springs, so then I bought the V-Twin kit just for those. Then I came across a factory plate, and used it and the leftover V-Twin plunger on my K-model. Yeah, I will make them consistent, probably keeping the 1962 correct.
Here is the K-model with the factory plate but the V-Twin guts. The V-Twin plunger does not have a Zerk like the factory plunger. You can see the factory plate has a little rise in the center, for the frame main tube. The gang here will know exactly what is going on here, since they have taught me some frames are relieved for this plate and some are not. The V-Twin plate in subsequent pics does not have that rise.
Here is the right side of the V-Twin plunger-- no Zerk. You can better see the rise in the factory plate too.
OK, here is the factory plunger with the V-Twin plate (and springs inside).
You can see the crappy V-Twin plate, that does not even seem to have the holes in the precise place for the plungers, and how it is flat, with no hump in the middle to clear the frame main tube. Note the factory plunger has a Zerk on the right and is cad plated. Like I said, the current V-Twin kit might be better, this one is a decade or two old. It never hurts to all Kirk at Sporty Specialties and ask if he has a factory one or what the V-Twin one is like. I think there are enough of these around you should wait for eBay, rather than add a Zerk and cad plate to a V-Twin one.