4.5" = 114.3mm. Exactly. That is the conversion, no rounding, feel free to try it yourself.
1"=25.4 mm. 4.5 x 25.4 = 114.3
Any wheel advertised as 5x114.3 will fit the bolt pattern for LBP mopars.
5x115mm will not unless you open up the bolt holes, I wouldn't do it myself, but I'm sure its been done.