The Z32 has never been made in natural HA.
The LU60A is NOT a bezel. It is a Lamp Module.
It features an "M2" bezel (part number 13586-11 I believe), an adapter collar for the M600 ScoutLight (E-Series) and a P60 Lamp Assembly.
It is Black HA (type III)
The LU60 is also a Lamp Module.
It features an "M2" bezel (part number 13586-1 I believe), an adapter collar for the Millennium Universal WeaponLight Series (MH90 Housing Body) and a P60 Lamp Assembly.
It is natural HA (type III)
The "M2" bezel has never had a Z-number.
SureFire redesigned the M2 bezel because it is the bezel used by the M95 WeaponLight - the most issued weapon-mounted light by the US Military.
Feedback from users was that the M95 was too heavy. SureFire redesigned the MH90 and "M2" bezel to reduce mass by a noticeable amount.
It appears that SureFire have replaced the Z32 bezel with the "M2" bezel.
Note also that the "M2" bezel is wider diameter (1.47" vs 1.36"). It therefore uses a different set of BeamFilters.
FM4x (1.36" diameter) - Z32 aka Classic WeaponLight "Taclight" Shock Isolated Bezel.
FM6x (1.47" diameter) - M2, 8X, 8AX/8NX/L7, KL3/KL5/U2 etc
Classic BeamFilters for Taclight (Z32) (1.36" diameter)
F11 - Red
F12 - IR
F13 - Cover
F19 - Blue
F63 - BeamShaper (Medium)
F64 - BeamShaper (Wide)
Classic BeamFilters for 8-Series (& "M2") (1.47" diameter)
F62 - Cover
F66 - Red
F67 - Blue
F68 - Traffic Wand
F69 - IR
F70 - BeamShaper
I hope this helps
Al