Disc brake Spindles

I just bought on ebay a set of front disc brakes for my 1970 electra off of a gs. The rotors are the correct 5on 5 spacing. Does anyone know if the drum brake spindles are the same as the disc. Also the seller sent me a set of a arms with the brakes no good to me, have any thing to trade or pay shipping.
Tom

 

Electra and GS use different set-ups ..........so ......you can not use the A-body spindles on your B-body. The rotors probably came from a 71-76. Disc brakes on the 67-70 models are hard to find. Also, the spindles for drum and disc are different.

 

The seller says they will fit{ OF COURSE} hOW CAN i TELL WHAT YEAR THEY CAME FROM AND WHAT MODEL. Did the a models come with the 5 on 5 spacing? This board is a great resource as i am new to Buicks.
Tom o No:

 

Reread the ad says they are from a 1970 gs. Asked him to send me the vin from car. If they do not fit my car will offer on this board,

 

A-body uses 4.75" bolt circle. Don't know what he has.

 

Rechecked the bolt pattern they dont fit my rims they are 4.75 inch spacing will put on parts for sale