GM/ACDelco no longer lists motor mounts for a 2003 with a V8 but they list motor mounts for 2005 and up, 19244832.
Will this mount work on a 2003?
Rock Auto offers cheaper aftermarket mounts listed for 2003 through 2009.
Paul -- good to see you. It's been awhile.
It looks compatible to me.
When I look up mounts for my '03 LWB V8 on Rock, the pics of the offered choices look to be the same as 19244832 (which Rock will find, via part search, but not offer for sale)
The important thing is the one side, where the mount points are offset.
Also, they expect you to retain / reuse the bracket.
Here's a pic of the GM 19244832, as found, showing the offset.
Oh, and separate L/R mounts are listed, so they're likely side-specific.