I realize it has been a few years! We just bought a home with those ridiculous baseboard registers also! I do not want the sharp, white metal ones in Home Depot and have been looking for a company that sells wood or brass. Different from you, ours are the standard 18 inch.Did you ever find a company specializing in nice baseboard diffuser/registers????? if so, do you remember the company's name? Thanks if you have any info.