chain for 021?

[iowaowb]

I was putting in an order for myself and my neighbor wanted me to order some chain for him. He had know idea what the chain was and no old box. I am not familiar with picco and the numbers on the bar. Could anyone decipher for me? Thank you.
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[Stihl-Pioneer]

16" 55DL picco .050
either 3613 PMC (yellow) possible kickback or 3636 PMC3 (green) which is reduced kickback

 

[gemniii]

I was putting in an order for myself and my neighbor wanted me to order some chain for him. He had know idea what the chain was and no old box. I am not familiar with picco and the numbers on the bar. Could anyone decipher for me? Thank you.
View attachment 160254

View attachment 160255

Check w/ Baileys.
Stihl lists several:
http://www.stihlusa.com/chainsaws/types.html

Bailey's cross references some:
http://www.baileysonline.com/saw-chain-cross-reference-chart.asp