Welcome, Kimberly, and congrats on your new friend Dottie!
You can buy covers from Scamp
at a fairly reasonable cost compared to custom work. Should fit all years. Mine are tight-fitting and well-made with full welting and large zippers. You can see them in their parts department online, but I recommend ordering by phone. I believe they will send fabric samples if you ask, as the online photos don’t represent the colors too well. Shipping can be pricey, but bundling a number of items reduces the pain.
Best wishes with your rehab!