Norcold Optical Display Board 631365 (fits the NX641, NXA641, NX841, NXA841 models) This is the optical board that fits all NX and NXA models, regardless of serial number. Here are the models it

Norcold Front Optical Board 638996 (fits the NX611/ NX811) This is the front control board for the following Norcold models, regardless of serial number:

Norcold Lower Door 635647 (fits the NX841/ NXA841) panel type This is the whole lower door for the NX841 and NXA841 model refrigerator. It has black panel retainers that go around it.

Norcold Optical Display Board 640087 (fits the N10DC) This is the front optical display board for all N10DC models with a serial number above SE079WDW00190.

Norcold Optical Board 640089 (fits the N8DC and N10DC) This is the new optical control board for the N8DC, N8DCSS, N10DC and N10DCSS with a serial number above SE079WDW00190.