What type of setup is this?

The attached image is of my Concord 4 system. What is on the right side of the board? Looks like some sort of expansion. I’m looking to get a 2gig take 345 to switch it over a 2gig system and need to know what I need to get. Thanks!

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Sorry looks like I can’t upload my pic. Basically it looks like there is an extra board attached vertically on the right side of the main large board.

Can you resize the image? Does the part you are referring to have a model number sticker?

Alright here is the image. thanks!