71 Dart aftermarket seat belt info and suggestions

Hello Mopar Family. I currently have lap belts in my 71 Dart. I am looking replace the front seatbelts (bucket seats) to aftermarket shoulder belts. Looking for any guidance or experience people have with a cost effective replacement. Is there a left / right…… Summit Racing has shoulder belts that are reasonably priced …….. any thoughts. Thanks in advance RonD