77 frame vs 80 frame questions

Does anybody know if there is any difference between a 77 and 80 xs 400 frame? I know the bikes were a bit different but I feel like the frame hasn't changed inbetween those years.

How often does a bike frame actually change right? I wouldn't be surprised if the sportster frame is the same as it was 20 years ago. Anyways any help would be appercaited.

 

I'm trying to mount offbran saddlebags and i found a set I like that a user said he was using the orginal mounting brackets off a 77 for them. I'm trying to figure out I hide 77 brackets will work on my 80

 

http://m.ebay.com/itm/1977-YAMAHA-X...ND-BRACKETS-PANNIERS-/272181615591?nav=SEARCH

I found these on eBay. Oem original. But it's for a 77 and based on what you've guys told me I don't think it will work. I actually think my pipes will allow these. Plus I'm not exactly sure where they mount.

 

Thanks for the input guys. I actually found an orginal King queen seat and it solved my problems. Now I can just strap what I need to the back of the queen portion.

I'm planning a coming of age journey this summer. Well coming of age as in I'm riding my xs 400 an hour away to camp by myself for a weekend. I know it's a far cry from the 70s and easy rider.

But I'm excited to see if I can do it. I want to see if my repairs I did last year will hold up yah know? To prove to myself I can do it.

And if anyone is interested there is 1 King /queen seat left on eBay like this. They are factory originals and STILL have Yamaha stickers on them from the factory.