size

Hello i'm looking at custom wheels but are a little confused on what to get. I have factory 18x7.5 , 5x115 , with an offset of 55mm. ( https://detroitwheelandtire.com/hol-2263-psp-a.html ) My problem is i can barely find one with 55mm offset. 1) Can I choose one with an offset of 40mm or 45mm...