DOOR ASSEMBLY (R-1874-T). The Sharp part number is CDORFB312MRK0 This is a Genuine Sharp part, not aftermarket.

This part is also known as: SHACDORFB312MRK0, CDORFB312MRK0, B0FTRT1WLH

Does your part fit?

Many replacement parts look correct but won’t fit your model. This microwave part fits the following models:

Sharp:
R1874