That is the lowest part of the rear frame that is a very flat triangle with a hole at the center.
Poulan offers owners manuals on the Electrolux-hosted website for free download. Results can be a bit variable
Poulan and Poulan Pro make them
Poulan
Poulan Pro do
Poulan Pro do
Key Poulan was born in 1962.
Claude Poulan was born in 1915.
Claude Poulan died in 1995.
Poulan Pro do
Here is the part number for Poulan... they are all universal from what I can tell (Ryobi, Homelite, etc). Google it to find a seller. I needed 3 of them, so I ordered six since they are cheap and shipping is a lot. Poulan 530095894
CRAFTSMAN POULAN 1800/2000 CHAINSAWCRAFTSMAN POULAN 1800/2000 CHAINSAWa craftsman poulan 1800/2000 chainsaw
don't buy a poulan as the bake handle fails in operation