Measure the distance between the mounting holes and compare to the bolts under your triple trees. Let us know what you find out!
Sorry not to check in quicker, but I'm on my ride vacation and getting beat to death. The lowers are all must for me when I get back!
I failed to say that I did go back to check the spacing of the holes but the bike had sold. I have a set of national cycles lowers but they don't work unless you buy their lightbar to go with. Not going to happen. Guess that's what the member I got them from thought as well but fail to tell me!

The MS ones are a good option but the ones I gave a pic for look great as well....... As long as they function.
You might be able to attach the top of the Nat'l Cycle lowers using a "P" clamp or similar instead of the lightbar. The other alternative is to get a spare set of front turn signal mounts to use for the top of the lowers....which is what they normally attach too when you use the NC lightbar (turnsignals are moved to the lightbar and original signal mounts are used to secure the lowers).
The Nat'l cycle lowers are actually pretty effective, but I replaced mine with the Memphis Shades type when I got rid of the NC lightbar and windshield.
Good luck.