Tractor PTO Sleeve Type 1 Inner ferrgie sleeve increaser to make up to standard Modern PTO size (from ferrgie small shaft 1.1/8th "shaft to Normal modern 1.3/8ths" shaft) ..slips into (inside) overun adapter type 1 above, without extending its size (reccomended)
Tractor PTO Sleeve Type 2 Outer Ferggie type PTO Sleeve increaser as type 1 above except outer facing @ 3.5 inch length & goes on shaft where Overun adapter is NOT required...simply upgrades size to modern.
Tractor PTO sleeve Type 3 Outer Ferggie type PTO sleeve increaser as type 1 and 2 except 5 inches length