I believe that listing is incorrect. Those stays should fit 75 - 77 model year, but not 78. I do not have another to GL1000 to compare to, but believe 75 - 77's have M12 x 1.5 threads, where as a 78 has M14 x 1.5 threads. Partzilla shows a part # of 90129-431-670, only used on 78's.
I found a...