One of my favorite tanks.
Some extra clarification on a couple points.
During its production run, the M41 was also employed as a test bed for a number of different turret configurations and armaments including the 90mm M35 gun that was later employed with the M46A1/M47/M48 Patton series of tanks.
The M41/T49 variant was tested with the medium-pressure 90-mm T132E3 semi-smoothbore gun, which was designed to fit in the same space and weight profile as the original 76mm M32 gun, the same caliber but
not the fully-rifled high-pressure 90mm M35. The new 90mm T132E3 cannon tested early APFSDS rounds. Trials started on May 5, 1954. The trials were a success, but the tank never saw mass production due to lack of interest from the military authorities.
There was an artist concept of a M41 with a M35 but that was it.
T49 Light Tank with 90-mm T132E3 Semi-Smoothbore Gun
The T49 was an experimental variant of the M41 Walker Bulldog replacing the 76 mm armament with a 90 mm, identical caliber to the armaments on the Patton tanks (M46, M47, and M48).
That included the replacement of the 76mm gun with a 90mm, or in some cases a 105mm gun.
Taiwan replaced the original M32 with their manufactured variant of the M32 known as the M32K1. Taiwan also develop the T-65 which was their "improved" version of the M-41. They used the AAI 76 mm M464 APFSDS-T round for much better performance...
, which Denmark also used in their improved M-41DK variant.
In Brazil's M41B variant bored out the 76mm to 90mm for their low-medium pressure Ca 76/90 M32 BR1-3 guns which used the same 90 mm ammunition as the Cockerill 90 mm Mk III gun.
The 105mm experiment used the Cadillac-Gage Stingray light tank turret on the M41 Chassis. Never was adopted.
M41 Walker Bulldog with 105-mm L7 Low Recoil Force Rifled Gun
Reference: SHERIDAN - A History of the American Light Tank Volume 2. By R. P. Hunnicutt
Plus elsewhere.
BTW- The M10 Booker has gone into production for its intended role.
My .02