I recently picked up a police trade-in 3953. Factory Novak night sights and no mag safety from the factory. Some carry wear but nothing too dramatic. All in all a nice flat and light carry weapon.
As could be expected on a 20 year old pistol, the night sights were dim. Also, my close vision has gone to poop over the years so I thought I'd give the XS sights a try.
They do not list a set for the 3953 on their site but a quick email to their tech section gave me a model number. SW-0003P-5. Brownells had them in stock. They arrived and included detailed instructions. They were dated '11.
The install was pretty easy. Some file work is needed, but nothing too crazy. Once I drifted the front and rear sight into place I reassembled the weapon and took a sight picture.
I am very pleased, as the large, white dot draws my eyes. I haven't fired it since the install but I will report back. I'm not expecting to be able to hit a quarter at 25 yards, but for minute-of-thug these should do just fine.
To sum up, if your vision is poor give the XS Big Dots a try.
I'll try to grab some pictures.