I can only speak for my experience with one gun. A pre B CZ 85.
My front sight had a round tenon. The tenon is the post on the bottom of the sight that sticks down into the slide and is "staked" in order to hold the sight in place.
The LPA adjustable sights I bought for my pistol were for a Pre B type CZ 85 or CZ 75. However, the tenon on the front sight was rectangular and pretty thin. The tenon was too long to fit in the round hole and too narrow to fill the hole side to side when shortened enough to fit the hole front to back. I elected not to use it for a couple of reasons. One was the slop between the tenon and the hole in the slide/bushing (on the Pre B guns the tennon also holds the bushing in the slide, so there is a hole in the top of the barrel bushing the tennon sticks down through). The second was the LPA sight did not have a portion of the sight that fit down into the long slot on top of the slide to also give the sight some strength if struck from the side of the sight.
I bought a 1911 front sight with a fiber optic filament in it. That tenon was a large square too big to fit the round hole. I had to file the tenon round to make it fit. It also had the portion of metal, under the front sight base, that fit down into the slide to make the front sight stronger to side to side bumps/knocks. I had to file just a small amount of metal off the side of that part of the sight to get it to seat down in the slide, but tighter is good (in my mind).
You may be able to find a gunsmith who would take on that job. No idea what the cost might be. I like to tinker with my stuff so I did it myself.
I had to modify a 1911 front sight staking tool, I made my own tip (the part that impacts the tenon and swells/expands it to fill up the hole and keep the front sight in place) and I bought some of that black Loctite that people tell you never to use because once you put it on something you'll never get it apart again (that was the idea, permanent installation).
I put the black Loctite in the hole in the slide (from the top only), put some on the sight (tenon and the portion that sits down in the slot in the slide) and staked the front sight in.
It's been to the range just once and I only fired about 30 or 40 rounds through it to sight it in. It was hitting low/left with the sights as installed. Took 4 or 5 clicks to move the group right and about 6 or 7 to move it up at 13 yds.
I'll have to put a lot more rounds through it before I'm confident the front sight is there to stay. I've had issues with front sights on a 1911 in the past. Gunsmith installation, sight came loose, took it back, sight came loose, had the guy silver solder it (which discolored the bluing on the slide) and that time I completely lost it out on a sandy/rocky range. This time I figured I'd just do it myself, sure couldn't do any worse.
Good luck with yours. I'm not a fan of fiber optic sights but I've got to admit it sure helps me see it quicker/better.
