I don't think you'll be finding 1.5" mandrel bent fittings off the shelf, that's pretty small for automotive exhaust, most of what you'll find at the local places is plain bent aluminized exhaust tubing.
However as said there's plenty of places selling mandrel bent fittings online, you can even go stainless if you choose and have the welding equipment, then you don't have to plate or paint.
mystic_1