The Covenant LFP40-CT (WD914-40CT) RV electric fireplace has a published rough opening size of approximately 36.75 inches wide by 17.125 inches tall and a depth of about 6.313 inches. Its overall front dimensions are roughly 40 inches wide by 17.7 inches tall by 6.2 inches deep. Your existing cabinet opening measurements of 38.5 inches wide by 17.5 inches tall are sufficient to accommodate this unit. The glass front size on your current fireplace is very close to the Covenant model, making it a suitable replacement for the Furrion FF40SW15A-BL in your 2019 Keystone Laredo. For the best fit, ensure you measure your cabinet’s width, height, and depth carefully, and consider that mounting strips may affect the opening size. Ordering the fireplace online through Elkhart RV Parts provides savings and a secure fit guarantee.