Distributor question

[jbbarrus]

I bought a new distributor cap and rotor for my 1985 Bronco II 2.8L. The original, and the one I got from the parts store, looks like the brown one on the bottom. The one I removed is very much different. I was asked in a previous thread if I had converted it to a duraspark. Is this the correct rotor for a duraspark distributor?

 

[tw205]

Take a picture of the distributor. The duraspark has two cap and rotor options. Both very different. Easiest way to tell is does the distributor has a vacuum line or just wires.
I have 3 out in the barn. The top picture is like the factory rotor