Buying Advice Trying to buy 1960's Massey Ferguson 165 nose cone; grille parts, and side panels

[Taylormade2017]

Hi, I have a 1960's MF 165, with a bent up nose cone and completely torn up grille. I am trying to get the proper parts numbers to purchase replacement parts. I have the original MF 165 parts book. I have ran into some trouble though. When I opened to the section on hood cap, grille, and side panels, I saw where there are two columns. One says "Std. R.C." and the other says "Dual Tri." What does this mean? I don't want to buy the wrong parts. Any help would be greatly appreciated. Thanks.