Are you talking about the 4 rib 16X6.50-8 wheel/tires? You can get replacements that are VERY close to the originals from Miller tire.
http://www.millertire.com/products/l...sle-rib-4-ply/
Here is a pic of my 147 with those tires mounted. The left is a new one and the one on the right is the original.
I've since replaced the original so they match.
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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.