Interested. Do you or anyone else know if the hole spacing is the same between 13 and 15?
I was looking into this a while back. From my research, I believe the mounting set up is different. The older glide fenders bolt on from the inside into the forks ,and the Rushmore's bolt on from the outside into the fender inserts.
I don't know this first hand, only from research on the interweb. I'm sure the op can verify the way this fender came off.
2010 FLTRX , Stage 1, 13" Madstad, Mono tubes, SuperShox, Heritage style bars. Alpine CDE-HD149BT,Soundstream Picasso Nano Series PN4.520 , 5X7 and 6.5 Infinity Kappa speakers
If I have to explain ,you wouldn't under stand anyway.