Figuring out Keihin needles??

[InPiEcEs]

Just wondering how to figure out Keihin needles.
I know they go by length, diameter, and taper, but I'm not sure how to figure out the letter system they use.
Can anyone here tell me how it works?

[4cylinders]

hey, get the book from sudco.com .

[InPiEcEs]

Got one here pretty similar, for Mikuni, which is what the Sudco manual is as well...Mikuni.

[4cylinders]

hey, oops, I meant to say catalog. If you don't have one, let me know, I can scan the page.