Poston carries the scoops (but there is a waiting list sometimes) and I believe Year One has the grilles.
You realize the 71 grilles are different? Eddie is right about the source except I do not recall that they have 71 grilles.
Are there two pieces to the grills Im not sure. I know there are two grills but do two pieces make one grill?
71 GS hood grill Duane H. on the board repos the 1971 GS hood grills look at his web site it is listed there and I think they are aprox 170.00 for a pair