Which Carbs on 76? KZ400D3

Here's what I think I know

Titled as 1976
Owners manual for 1976 D3
Frame# K4-507882
Engine # K4E-054171
electric start

So I'm thinkin 1976 KZ400D3 standard

Here's the real problem. Checking for a few replacement parts for the carbs and it seems I am either not reading the parts catalogs correctly or the carbs may have been swapped out on my bike. For reference Bikebandit.com shows carbs for a 74-75 KZ400/K and 76 KZ400-D3 76-77.

The carbs on my bike are most certainly the first set with float valve seat separate from the carb body(I need the o-ring for the valve seat), and the simpler enrichener(sp?) valve. Is this common factory parts sourcing or just a later carb swap?

The engine intake boots are cocooned in silicone. If the factory carbs are not on there would this cause fit issues with the different set of carbs? I will probably replace these boots as well. Im just hoping to avoid trial and error by fishing your collective knowledge.

Also I need to replace the felt bushings on the butterfly shafts and can't locate any.

Any help or advice would be greatly apreciated.