New Dana 60 Help please

I have a 1973 Plymouth Gold Duster with asuoer weak 7 1/4 I wanna ditch so I came across a dana 60 off this 4x4 Dodge Firetruck for 80 bucks but this thing has a 12 bolt pattern.

Also the wheels and rims that came with this differential where out of my price range is there an easier way to convert this to a more useful bolt pattern that I won't have to break the bank and it'll just work?

I had bought this Right stuff Detailing Disc conversion kit a while ago not knowing that it was for 8 3/4 and Dana. 60 only with green bearings. Could you guys lead me in the correct direction of what to do with what I have?

Sidenotes. I can still go get the wheels and tires for the rear for 100 for 3 wheels and tires

I have the brake lines yoke, and leaf springs from the truck also. And I have a video on YouTube with a more detailed look at th differential if anyone wants a better look.

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you will need these Mopar 8 3/4" (8.75) and Dana 60 Billet Steel Housing Ends
then you will need 35 spline axels some green bearings and seals . the axel tubes need to be cut the proper length and the new ends welded on there are videos on you tube . there is a lot more to it but you get the picture .