Hoping somebody can help me out. Recently had my Narco AT150 transponder replaced with a Garmin GTX330. The avionics shop didn't do a W&B update, and I'm pretty sure it needs to. With the current lockdown here in CA, I figured I'd spend some downtime getting everything together. Anyway, Looking at the specs for these units, the Narco weighs in at 2.3 lb and the Garmin comes in at 4.2 lb. The Garmin install manual shows its CG 4.9" fwd of the panel after installation. The Narco install manual doesn't show the CG position. Anyone know of an official spec for this?