looking to buy rims dont know whats my offset (mm) and lug pattern (mm) can anybody help me out thanks

 

stock is +55 5 * 114.3/5*4.5 aftermarket wheels that will work well will range from 17/7 +40 in the extreme to 19/8.5 +50 lowering and tire size will effect what works well..i have a 17/8 +48 with 245/45/17 front draggers with no issues

 

I am purchasing the Momo GTR 2 rims off some guy on ebay that are 5x114.3 and +40 at 18"x8. Does anyone out there have that same size on thier cars? Tirerack uses 18"x8 with a +42 offset will that -2 really make a big difference?