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In all other aspects the bushings would have to be identical to the OEM units, including design, dimensions, range of motion, etc.
Replacement poly bushing from an 'off the shelf' supplier should fit your requirements. The OD would have to be the same in order to fit the given hole, the ID of the tube should be the same to utilize the OEM bolt, and the design should be the same - placement in the bushing material so that there is no static bind, and the range of motion - what range of motion? There is a big difference between material COMPLIANCE and full-blown range of motion designed into the product.