Broken drawer slide support

Hello. I live in a condo that was built in the mid-80's. This morning I awoke to find the drawer no longer supported with the left bracket broken in the back of the cabinet. Can you please help me determine which support I need to fix it? Unfortunately, the brackets are glued, rather that screwed in to the wall... The cabinets are commonly seen and originally were cream with a natural wood strip where you pull them open. We have painted them...
Apologies that the one photo is upside down...