A:Answer Hi - It's nice to hear from you! We certainly appreciate your loyalty.So that we can provide dimensions, please provide the model number of your 30 year old GE oven/microwave combo. Also, take a look at the following link "Measuring for a New Wall Oven": https://www.geappliances.com/ge/wall-oven/wall-oven-installation-guide.htm - Model JK3800SHSS is also designed for installation in a standard 27" wall oven cabinet. We suggest viewing the Quick Specs document the following link: https://products.geappliances.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=320134_jk3800sh_c2.pdf -
GE wall ovens are guaranteed for an exact fit or GE Appliances will pay up to $300 toward modifications. See offer criteria and details: https://www.geappliances.com/content/migrated-ge/wall-oven/79756_built_in_ge_rebate.pdf - If you have any additional questions, do not hesitate to ask, we are happy to help at GEAppliances.com! Sue