[72cs20]

Thanks for the positive comments everyone.

rpone605, The only parts replaced were the black bushings (aka - pucks, donuts...) and the washers and bolts. The frame and cab are original. No drilling or any other modification needed. With air tools, replacing the front bushings took all of about 20 minutes.

I bought this cab mount kit from LMC and they listed it as 60-66 1/2 ton. It comes with all of the nuts, bolts, washers and bushings. The bolts in the kit for the front bushings are too short for the 3/4 tons so LMC offers a different part number for bolts for the 3/4 tons. I ended up getting the correct bolts locally. I'm still not sure why or what the differences are between the 1/2 ton and 3/4 ton trucks, or between model years, when it comes to cab mount bushings but these seem to work.