A:Answer Hi Lindsey - Thank you for reaching out and for your patience! We truly appreciate you choosing a GE microwave to replace your current model and are sorry to hear that the model you purchased is not a compatible replacement. We understand that this can be a confusing process and are happy to offer you guidance in this. While there is not a specific replacement for the SpaceMaker II series models, we usually recommend the PEM31 series countertop models, as they have similar dimensions and can be built-in using a compatible trim kit. - Assuming you are looking for a Stainless Steel appearance, we would recommend the PEM31SFSS model, which can be installed using the JX827SFSS (27") or JX830SFSS (30") built-in trim kit. If you would like to learn more about this model as a replacement for your microwave, please reach out to us via our Contact Us page online with the full model and serial numbers for your current model, as well as your name, address, phone number, current email address. We are always happy to help! -Eliza@GEA