Here is what I've received:
UNT will be the side with 22,23,24,25,26…..
Sections 19 to 28 are “blocked” off for UNT tickets sales at UNT. You can buy tickets directly from the Heart of Dallas folks, but you will be in the end zone or on the UNLV side. Only a small portion of the UNLV side is blocked off.
Here is the seat map, you can click on each section.
http://heartofdallasbowl.tix.com/GenericMap.aspx?EventCode=607750#
If you “click” on sections 19 to 28, you will see that they are blocked (because they are being sold through UNT), but if you click on the end zones, you will see the available seats. Also, there are “no” chair back seats on the UNT side. You can bring chair backs/seats to the game.