Bushings for the lift arm and top link pins are cheap and easy to find at your local farm store or on-line.
The issue is that if you have factory mounted sway blocks on the 170 they are 99.9999% of time Category 2 blocks and you cannot get the lift arms close enough together to mount a category 1 implement. You have to remove at least one sway block to do that and then you don't have proper sway control thru the entire lift range with a sway block removed.
Allis made Cat 1 sway blocks but they are VERY VERY hard to find as they haven't been made in decades and nobody is reproducing them yet aftermarket like the Cat 2 sway blocks. If you find just one Cat 1 sway block I believe you can mount a Cat 1 implement with it but there is not much "sway".
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