DO NOT BUY BY CHAINS BAR LENGTH !! Match you pitch gauge and drive link count - only way to guarantee it will fit your saw.
There are many sizes of chain that are called 20" it is a generic term used to describe bar. All chains are precisely sized by PITCH GAUGE and DRIVE LINK counts.
Chain Size :
Most Common application - Poulan 5020 & 5020AV Saws (some had D72 setup so not all of them use this size )
This chain is made from USA steel, processed on German machines using China Labor.
It is a high quality chain intended for a Pro user.
This size is not very common - so please verify the PITCH GAUGE and DRIVE LINK COUNT you need before you buy.
If you are not sure on chain specifications please don't guess, ask for help - often the information you need is on the bar of the saw stamped near the engine case. We cannot 100% match from model of saw and the length of bar. The numbers on the bar are the best information. All 20" bars are not really 20" and each brand model has different possibilities for chain fitment even though they call it a 20" bar. Pitch, gauge and drive link count are the only sure way to match a chain.
Picture 3 are of another manufacturers package - shown to give you a list of possible applications this size was used on- it does not guarantee fitment.