Also a 22 top can fit the stock 86L chain.If you have your spec sheet it will tell you. Ulmer posted this in the frequently asked questions
There are some spec sheets posted there too
129 & 137 with 1.25" track models gearing = 21/41, 86 link chain
137 & 141 with 1.6" track models gearing = 21/41, 86 link chain
137 & 153 with 1.75" track models gearing = 21/41, 86 link chain
141 & 153 with 2.25" track models gearing = 24/50, 92 link chain
162 with 3" track models gearing = 21/49, 90 link chain