Brake rebuild Caliper # Help

[FastCletus]

I need to do a front brake rebuild.  IN my ever going saga of not knowing exactly what my front end is, and there for not knowing what front calipers I have,  Is there anywhere on the calipers that will be able to direct me to the correct rebuild kit.  I know each caliper has 2 pistons.  Sometimes I think its a CB 900 C or a GL.  Brake pads are FA/69 EBC

[FastCletus]

BTW the brake piston is 30mm x 35mm if that helps

[shinyribs]

They can be confusing. Maybe post a pic of them and see if someone recognizes them?

[FastCletus]

after  a bunch of comparison I think I have narrowed it down to a cb 750F 81 front end or maybe a 900F ( I think they are the same caliper assemby. )  
Oh well I guess it just makes it more fun.