I should state I have searched and most threads recommend the 75-76 GL front end.
Now The 79 I have found has gold anodized rims, 19 front 17 rear. i thought the 79 GL's came with comstars? I like the spoke look and want to keep the same theme.
The spoked wheel front end you have is probably off a 1976 "LTD". They were a limited edition that came with gold accents. 75-77 GL have spoked wheels, 78-79 GL has comstars.
Click on the link in my signature.
The 3rd pic shows the differences between the early and late GL front ends. The mounting lugs for the calipers on the early forks are wider apart than the later years (pic of the late front end was converted to early spoked wheel)