The ball is easy 3/16" , hardware store, The spring 0.180 OD, 0.032 wire Dia., 0.300 Long, there are about 4.5 convolutions, I believe Roy Nacewicz sells these plus the lock washer for under the head of the cap screw.
The retainer ,I believe, is Ford P/N 48-3736 , your going to have to make one, or find one. Basic dimension is 1.200W x 1.429L x 0.050 Thick steel.