Join Date: Aug 2018
Location: Southwest Florida
They should say compatible rather than specific for the 300. I'd say they are universal. It is true the bolts are not the right threads. I believe they are imperial and you would need metric. 8 x 1.25 x however long you need. I think I picked up 80mm. They are very nice bags but I had a terrible time installing them on my wife's 300ABS.
My issues with them:
They can be used as throw over or fender mount. They came with the throw over mounts pre-drilled and attached, so when they're removed, you already have holes to fix.
We didn't get the fender seat so they looked better sitting a little lower and not extending up past the fender too much. This means you have to use spacers that come with the install kit. You have to mount them far enough off the fender so they don't crash on the brake on the muffler side. You also have to take care where you position the support arm to make sure that also doesn't crash. And don't forget the bike moves down when you sit on it and/or hit bumps on the road. The brake doesn't move so you either have to position them high enough not to crash or use the spacers to get them far enough out to miss it. If you use the spacers, you need to make sure the support arm is high enough not to crash also. I didn't think about the support arms and had to readjust the position, so more holes to fix.
In the installation video, they show that you just put the bag against the fender and mark the holes. The bag doesn't fit against the fender. When you hold it up, the shock cutout isn't deep enough to allow the bag to hit the fender. I put bolts in fender and used that to mark the bag. It worked, but not as precisely as marking directly from the holes would have been and I had to enlarge the holes a bit from being a little off.
I've never mounted saddle bags, so these may be things that are commonplace for someone who's done it before. The instructions say nothing about the issues I had installing them and a little warning about the gotchas would have been nice. The bolts I got were extra long because I didn't want to have to go back to the hardware store. I figured I'd just cut them down to size when I figured out the proper length. Since I had to use the spacers, the extra long bolts worked without cutting them.
I don't know if the 300 is different from the 300ABS as far as the brake size and position, so you may have an easier time with them. They are very nice bags, but the install at least for me, was not as cut and dry as their videos make it look.