For the front you might try eBay. There are often various RV replacdment decals listed there. Or if you can get a decent picture of yours and take it to a vehicle decal/wrap shop they can probably make some. If your decal is too deteriorated you might see if some one with a good decal can provide a good pic.
For the side, a decal/wrap shop can probably take a picture of the driver side, reverse it, and make new decals for the passenger side.
Or, if you want to stand out from the crowd
try here.