10” brake drum ? 69 Dart

Hello all
I’m going to be fixing the (4) drum brakes on my car from it be parked for many years .
Can some one tell me if there was more than one sizes of 10” drum brakes that could of came on a 69 dart gts 340 car ? I have read some post on here talking about width of shoes and what not ? What would of been stock factory if nothing was changed ?

Also can any one tell me what the bore size for the rear wheel cylinders ?

Thank u for any info .