Sure glenno.
Rock Bro's Mtb Fenders work like a charm !!! They also accent that edgy, Dak Knight look the Ltd's have.
I broke out my Dremel and made small, square cutouts on the rear fender and sandwiched between the racks lock-blocks, with the arms running underneath. Front fender(s) are two parts. The front most has "T" shaped cutouts about 3" up the slot for the original tab fastening mechanism, and again the racks bars that connect to the fork run through and underneath. Two small holes, about the middle of the rack and a (YES, you nailed it) Zip tie. It's tensioned so the fender presses firmly against the fork. There is no play, are no squeaks, rattles or any hassles -- except the stock expansion mount for inside the fork tube (Second front fender piece) has loosened a bit. That's the attachment you were asking about. I suggest installing that fitting with the front wheel removed. Not an option for me because my rack is attached to the skewers. See the photo.
These things don't break, dent, rust , and clean easy. At $21 I wasn't worried about making the cutouts. Thick plastic. Came in about 2 weeks.
https://www.aliexpress.com/item/32790795364.html?spm=a2g0s.9042311.0.0.27424c4dyDbLJT
Do you have a front rack? You can read my other posts on various racks for our Ltd's.
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Mounting your rack - to mount the fenders on.
I ended up drilling a hole, dead center in the forks U brace. I 'bunny-hop' curbs. I want sturdy. No other way worth a damn. So, before some 10-speed owner starts with the "Oh my, not the drilling", I suggest they check out the casting itself (Read: if you don't own one, don't start pontificating to those that do) considering a Ducati Motorcycle is riddled with holes, cut outs to lighten the weight.
The danger
in this case is the uneven mating surfaces; only a very small portion is making contact and thus, cracking or wearing will result.
I sprayed a little cooking oil on the U brace back side, took a wad of clay and molded it in as a plug (flattened the sides with a little knife, mushed it around until I liked it and left it until the next day.
Removed, I used that to piece to outline the angles on a piece of aluminum block I had laying around, drilled a slightly oversize hole for my bolt, filed the back-facing face relatively flat on a plane that evenly distributes the weight of the washer and nut.
I also ground a bolt for the racks attachment point to an angle where it abuts the fork's U brace, so it too fits even and snug.
It was actually simple. I have a little vice; a drill; a dremel and some nice small files, but a pair of vice grips (to hold while you drill) and a file works fine.
I plan to take it all apart soon and check if how much contact that plug is making with some dye. I'd bet it's like 90%.
You cannot attach a this systems front most fender or a single piece front fender via a tube compression insert. It would be crushed when the fixed point conflicted with the fork travel. You could risk attaching under the U brace (where the fender would travel with the fork), but you would have more than "2.0 of travel possible with the fork and less than "1.0 before it crushes.
Probably work - but also consider the aesthetics of the completely round fender (required), plus the arms required.
IMHO You loose that transition from the edgy frame's angles, directly to an organic shape (the wheel).
I tried a round fender and best I can put it, the look "feminized" the bike. It eliminated the the almost brutal - minimalist - transition that these Enduro style fenders accent - and the bike already has. The very large round wheels (white-walls don't help) took over and it just didn't fit the bikes personality or my taste. The look would be complete only with a handlebar mounted wicker basket full of posies and a loaf of French bread sticking out.
Hope this helps,
Fast n' Furious