hey guys just some info on wheel offset please

[imiitek]

i have the re amemiya  kit on my car with stock wheels on i am wanting rpf1 in 18"
i want 10" rear and 9.5" front but tight against arch
im just worried about the offset of wheels, both front and rear arches are wider than stock fenders
i am asking for advice on offset for front and rear please
buy my ester-mate rear arch is 1" wider than stock front about 1.5"
any help would be appreciated thanks
best info i have found is offset is 18x9.5 +45 in Front
18x10 +38 in Rear but i think that\'s for stock arch

[imiitek]

thanks for your help guys seems +45 is the best bet for front