Nope, nothing strange, just the same old flimsy 20 year old Honda side covers, EXCEPT that the Left side cover is unique to the 77 & 78 750 Supersports, the right side is also used on (if I remember correctly) the 75-78 supersports, but the left one was only made for 2 years. With such a low number of bikes, none of the usual aftermarket folks make this cover (except for DSS). There was a fiberglass company in Australian that did for a while, but they no longer list it.
My big question is the large number of newbies that are all restoring 77 & 78 supersports now (including me!)