I'll keep talking with myself. heard back from a dealer while i was driving, 2 revisions on the seat heater with ventilation, and no notes even with the VIN to decide which one is the correct one.
LH mat with the 1.5 inch neck is part #23170194
LH mat with the 1 inch neck is part #23223774
Decided to wing it and go with 1.5" inch neck, i'll see if that was a good decision or not. And since i was ordering that, i decided eff it, and ordered new seat bottoms for both driver and passenger, and if i'm going through all the effort of swapping the foam, i might as well slide new leather on there too rather then reuse the old stuff. So i pulled the trigger on that last night, should have soem freshly comfy seats next weekend for the Suburban. Thankfully i'm taking the wife somewhere nice for thanksgiving, so maybe she'll let me just tinker in the garage on Saturday? Ordered the durafoam from the seat shop via amazon, along with new leather from them. Took a while to find it on their amazon store, but buying it there let me save 5% and use some amazon points i had racked up to drop down my out of pocket price. I'm just hoping the mat i ordered will work for me, if not i have a feeling the seat is going to be sitting out and the suburban will get to spend some time in the garage waiting for a replacement