Paul F
I agree with Steve, 70 hood/decal on a 100. The early 100's used the same steering wheels as the 70. The air cleaner is for a 10/12 hp engine. I would think that the unit would have been installed on a 10 hp or higher, engine. The later trencher built by Hawk Built (I know, different company and trencher) was advertized to go on 10 or 12 hp tractors.