[30Murray]

The later style solid or hot rod king pins will not work with model a spindles and axles. The thrust washer sits above the model a spindle so it's kingpin is essentially carrying the weight of the car. With later style spindles the thrust washer sits under the upper spindle flange so the kingpin has a thin top flange not designed to carry weight. Hope I described this clearly, just look at drawings to see what i mean. I learned this the hard way after buying some later style kingpins for my hydraulic setup - they are now paperweights.