Depends on the year. The 3A uses an inner hardened steel sleeve that rides on the inner fulcrum pin. A nylon bush is pressed into the lower wishbones. The nylon rides on the steel bush. Nylon washers fit to both ends of the wishbone and a rubber seal is stretched over the nylon washer to keep moisture and dirt out. There are no grease fittings for the inner fulcrum pin.
Earlier TR2-3s used a pair of rubber bushes instead of the above configuration. I havent seen poly replacements for the TR2-3 but I'm sure you can find them.
The later style nylon and steel was a "factory-approved retroactive modification" so it appears to be a better approach to the inner fulcrum mount.
December 1955 TechnicalBulletin
<div class="ubbcode-block"><div class="ubbcode-header">Quote:]As a result of investigations carried out by our Development engineers, it has been found possible to increase the life of the Bottom Inner Fulcrum Bearings
employed in the Front Suspension units fitted to the Triumph Sports car.
The original rubber bushes, Part No. 102228, fitted to the bottom inner fulcrum have now been replaced, in normal manufacture, by bearings of nylon material which provide better bearing qualities and consequently have a longer useful life.
The nylon type bearing was introduced in normal manufacture at Commission No. TS.912l. This modification can be made with cars prior to the Commission Number quoted above where normal replacements are required.[/QUOTE]
Hope this help you.