URX3.1/URXIII Deluxe Panel Kit Consisting of:
1 - 4" Panel w/Handstop
1 - URX3.1 Handstop
3 - 4" Slim Panel
2 - 4" Panel
2 - 5.5" Panels
3 - 8 rib Rail Section
 
Hole spacing on the 4" panels is 3.175" center to center.  Actual length of 4" panels is 3.965". 
Hole spacing on the 5.5" panels is 4.765" center to center.  Actual length of 5.5" panels is 5.550".
Hole spacing on the 8 rib rail sections is 1.588" center to center.  Actual length of 8 rib rail sections is 2.970".