Jim,

Most of the external parts of the tail wheel are the same; i.e. The yoke. On SRE NC 20961 there is a fitting on the lower forward part of the main tail wheel post not seen on the YKS tail wheel. The rear attachment point of the spring to the main post is also slightly different.

SRE NC 58785 has a fairing that covers all but the yoke. The News ARE, NC 20953 does not have the fairing

P1 – YKS tail wheel
P2 – SRE NC 20961 tail wheel, side view Note the lip around opening,
P3 – SRE NC 20961 tail wheel, ¾ rear view
P4 – SRE NC 58785 tail wheel with fairing, port side
P5 – SRE NC 58785 tail wheel with fairing, note access hole to grease tail wheel post and shaft
P6 – Simple CADD drawing of the YKS tail wheel, courtesy of Skinny Bob.