hey i plan on getting new rims for my truck and the site im on tirepackage.com asks for the bolt pattern i obviously know that its 5 bolts but i dont know what the rest is the options are 5on5.5 and 5on5 and other ones too but i would like some help wondering what the other number is heres a pic of my rims if you need a pic

 

if your rims are 17s then you have 5.5