The 450 could be a 1958 model. Use the Serial Numbers link to the left under "Research & Info" to find out the production years of pretty much any old tractor. If you have the serial for your friends tractor you can look up when it was made.
IH made two different versions of the 300. Farmall and Utility. A loader from a 300 Utility will not fit a 400 Farmall.
Loaders made to fit the Farmall 300 were almost always also made to fit the Farmall 400. The 400 is about 2" wider than the 300, so usually it is just a matter of flipping some brackets, or removing some spacers.
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