Exhaust specifications

[Worldrider]

Does anyone have any good resources for information on the original exhaust for the '79-'83 CB750K? I'm specifically interested in the 1980 bike info. I'm seeing exhaust that are labeled, Sankei 2043, Sankei 2075. And it looks like HM425A is the correct fit. I don't want to accidentally buy an exhaust that is for a CB750C.

 

[jpdevol]

Consolidated Motor Spares shows the original p/n to be 18460-425-672 for the '80 US CB750K and show in currently temporarily unavailable. It is possible they have some coming - they are a very large dealer that specialize in older bikes. They do show the bottom right in stock (imperfect)
https://www.cmsnl.com/honda-cb750k-750-four-k-1980-a-usa_model7245/muffler-comp-4ex_18460425672/