Heater placement, drawing template

[JsMoose]

Hello,

I marked up my firewall sheet metal using the template provided in the supplementary instructions. The template says to position it 2" from the bottom of the firewall sheet metal... however, the cut on the sheet metal sticks up about 1/4" from the bottom of the cross member where it attaches. Am I supposed to measure from the bottom of the cross member or the bottom of the sheet metal? It doesn't feel right to measure from the bottom of the sheet metal as it is not a good reference (not square to the cross member).

IMG_5861.jpegIMG_5862.jpeg

I hope I'm being overly concerned and it doesn't matter, but I searched and couldn't find any previous material on this topic.

Thanks,
Jay