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Both are listed as 50" working width.

450 has provisions for cat 0 and cat 1, with adjustable lower mounting points.

The new 550 I just see one set of holes and welded on bottom mounts.

Any other differences, I read the 550 is 200lbs more so its it more commercial? the 450 is heavy too!

Are they both non oil bath side chain designs?
 

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The 450 was both cat 0 and 1 to work on garden tractors and sub compacts (limited lift) 647 replaced it I believe.The 550 was use on compact tractors with cat 1
 
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