I don't think you'll find an exact replacement for the tub/shower (exact in form, not looks). This has to do with the federal guidelines requiring anti-scald technology in a shower. What's there now is almost certainly not in compliance with those guidelines. You are required to bring it up to code if you replace, but not to repair what's there already. Since you essentially want to replace it, that's what triggers the update to current codes. There are a number of choices for the vanity in that configuration for that sink. You may want to look at those first, then see about the shower. Unless they left some spare tiles, you may be looking at tearing up more than you want in there. Do you have access from behind that wall (maybe in a closet)?