10 inch 11 inch disc brakes ?

[ht4spd307]

hello I'm a bit confused to which brakes i have its a 69 charger with factory power disc brakes .now I'm wanting to rebuild them and chasing new wheel bearings and dust seals now the vendor has asked what i have 10 or 11 inch but I'm reading the parts books and it lists the brakes as 9, 10 inch 11 inch and disc brakes. the dust covers on the 10 inch and disc brake listing have the same part  #  and 11 inch is a different part #  if I'm reading it correct i need bearings listed as disc brake part # and dust seals the same ones used on disc and 10 inch is this right ?

[Just 6T9 CHGR]

Yes I believe the 10" or 11" that they are referring to is the DRUM brake size. 

[charger Downunder]

Measure the diameter of the disc.?

[ht4spd307]

there is only 1x hub w/brake DISC with no size listed for dodge which is quite weird as normally would list 2x per car. I'm so confused