As long as it fits you can use it. I wouldn't get one that's too large as a 7HP- assuming your 71 still has the stock 7HP motor- isn't really made for anything larger than a 38" mower. You'll have more luck finding a period correct one to fit, but again anything will fit as long as you have mechanical inclination.
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Daniel G.
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(May 1970) 147 w/an IH spring assist, 48" deck, 42" blade, 1969 73, #2 trailer, 10" Brinly plow and (on loan) Dad's #2 tiller.
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