Not saying Hawks bushes arent hard, think black poly is the hardest poly but Nylatron is hard(er) nylon, different again. No specs as such John. I just bought a length of solid bar and machined my own for various things.
try www.lamins.co.uk/ they will have some stock, used to dealing with motorsport people and can supply.
Just checked the bush in Chris Richards old wishbone, definitely polyurethane, injection moulded and slightly deformable. Same applied pressure doesnt deform the same size nylatron bush.
I'd also check with Craig at ListerBell, his suspension bushes look a similar size and are definitely Nylatron, chance they may be interchangeable, worth a shot? Manufacturers tend to have their plastic bushes machined or moulded to suit the inner and outer metal bushes they use rather than the other way round.
Also, don't fit any type of poly or nylatron bush in the front end of the rear radius arms, besides rotational movement, the arm also transcribes an arc not in line with the pivot. If you did, you will end up with a snapped radius arm.
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