I like Bikebandit.com. They have the Honda parts microfiche BUT unlike many other places on the Web, they are updated to show what has been discontinued and what is still available. I've ordered a ton of parts from them. Here's the 76 GL1000 page.
http://www.bikebandit.com/Honda-Motorcy ... 76/m/m9474
There are MANY parts sites on the Web that have the Honda part microfiches and parts lists, many with prices. HOWEVER, most do not show which parts are discontinued and give you the mistaken impression that you have found a treasure trove of old parts. Here's an example.
http://www.mrcycles.com/fiche_section_d ... &fveh=3428
They are good for looking up PNs and prices. Then I go the bikebandit to see if the part is still available.
Bill in Alamo
75 Norton Commando 850
91 600F2My Gallery
Other bike history: 62 CL72 (stolen), 67 CB350 (stolen), 71 Norton Commando 750, 71 CB450 (x2), 75 400F, 76 400F, 87 GSX-R750, 92 YSR-50, 08 Daytona 675