Where can I find the finger for the Middleby Marshall PS200?

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You should call Middleby at (847) 741-3300 to get part numbers for what you need.  Then go shopping.

 

There are multiple parts which comprise a finger and several configurations.  Some configurations are specific to a customer (chain restaurants).

 

If you want to see the options, check page 98 of this manual:

http://download.partstown.com/is-bin/intershop.static/WFS/Reedy-PartsTown-Site/-/en_US/manuals/MD-PS200_spm.pdf