Disk brake 77 cj5 rotors "2 or 6 bolt" steering knuckle bolts?

I called 2 different auto part stores in town and they both showed 2 different rotors. They both asked if I had 2 or 6 bolt steering knuckle mounting bolts. Which ones am I suppose to tell them?

 

Two bolt caliper looks like this, the orange part. http://i331.photobucket.com/albums/l450/bdb5853/Gem of the Rockies build/30008.jpg
Don't have a picture of the six bolt bracket but you can easily tell the difference between the two. It's all in how the caliper bracket mounts.

 

So I need to order the 77 cj5 2 bolt knuckle rotor?

 

If your caliper brackets are attached like that then yes.

 

77 and 78 used 6 bolt caliper brackets and a 1 1/8" rotor.

 

So I need to say I have a 77 cj5 with the 6 bolt caliber bracket to get the right rotor if I am using chevy caliber brackets? I know I need a 1 1/8 rotor.

 

Yes. '79 and newer used a 7/8" thick rotor and are too thin if using the GM/FSJ caliper brackets. Take a tape measure in with you and measure the rotor thickness as many of the parts computers and some of the books have the wrong listings.