This is derived using a weighted average of various advance metrics such as Strength of Record, Game Control, and a few others. It is mostly results based but there are a couple of predictive-based metrics included.

1 Alabama
2 Georgia
3 Oregon
4 Iowa
5 Penn St
6 Michigan
7 Oklahoma
8 Michigan St
9 Ole Miss
10 Arkansas
11 BYU
12 Fresno St
13 Clemson
14 Notre Dame
15 Florida
16 Cincinnati
17 Ohio St
18 Coastal Carolina
19 North Carolina
20 Liberty
21 Kansas St
22 Virginia Tech
23 UTSA
24 Texas A&M
25 Army

Other notable teams:
29 Baylor
42 Virginia
58 USC
64 Boise St
70 Utah St
74 Arizona St
79 Utah
100 Washington St
105 South Florida
108 Georgia Southern
125 Arizona

Based on those rankings, NY6 games would be as follows:
Cotton Bowl: 1 Alabama vs 4 iowa
Orange Bowl: 2 Georgia vs 3 Oregon

Rose Bowl: 5 Penn St vs 40 UCLA
Sugar Bowl: 7 Oklahoma vs 9 Ole Miss
Peach Bowl: 6 Michigan vs 10 Arkansas
Fiesta Bowl: 8 Michigan St vs 12 Fresno St