Odd....because back in 2005 when I bought the SAP extension directly from GM in primer, it did come with the front license plate holder for it. I didn't buy the whole SAP kit, just the spoiler, extension, and grill inserts. I never used it and unfortunately got rid of it a long time ago.Welcome to the forum and the SAP club. Nice rides you got there.
The SAP-specific front license plate holder only came with the full SAP kit from GM; you couldn’t buy it separately. Back in 2005/06 or so, I had moved from MA (single green plate) to NH and needed to put a plate on my SAP front end. Even back then, it was quite hard to find an SAP front plate holder, but I was fortunate enough to find someone with the full SAP kit whose state didn’t require the front plate and they didn’t mind letting it go. It may be damn near impossible to find one now…..
Alternately, I’ve heard inverting a stock plate holder on the lower OEM grill works well, just not sure if that will work on the SAP grill.