What tracks should be on my D4?

'67 D4 78A7177. Looking for a used set of chains or tracks. I was told both D4 dozer and 941 loader tracks fit but on further investigation it seems there is more to the story than that. Among the possible variables; dry unsealed pins, dry sealed pins, 1.99" or 2.12" bushing diameters, thick or thin chain link thickness. On something this old there is no telling whats on there currently. What should it have and how do I verify if that is what is on there now?

Thanks!!

What tracks should be on my D4?