Here is 1 brand 20 inch Oregon chain. 20LPX078G. List $31.00
BUY IT NOW $17.95
This chain is for professional woodcutters that use .325 pitch saws. It has blued cutters for improved strength.
. The chain is .325 pitch .050 gauge and 78 drive links. If you have a k1 or 33 or 20 stamped on your drive link
there is 78 drive links like photo these will work with your saw.