Not buying any tractors now, That massey for sale would have been a very good deal considering they bring 2500 to 4000. ( well if a came across real exceptional deal I would buy another)the Oliver 55 is a nice tractor, but for parts, it is the highest . My advice would be to stay away from one.
All the other Olivers, 66 77 etc are less expensive for parts.
Many of these older tractor some more than others some parts are just not around. Expensive.
I bought my Massey 65 with a blown engine, but had new tires, new clutch. Very nice shape for age being a 58. Bought it for 1000 and bought 2 engines for a 1000. A real good one and not so good one. But extra parts. I repowered it.
there is a guy southern wisconsin which parts tractors, I was down there month ago bought 2 rears and 4 front tires for 320.00. needed tires for 8n . Rears were not bad some cracking prolly 60 percent tread and good rims, fluid filled. Then the 4 front tires were all pretty good with good rims.
So expensive to fix tractor tires and or to switch tires on rims. Getting around here not many places left that do it. Only 1 and hear he is going to quit and retire.