I just bought rpm 505, 38 offset all around, 8.5 / 9.5 x 19 and the back looks fine, but the front looks a bit odd. The lug nuts disappear inside the rim face on the front, on the back, they sit at the front. I can tell the front face is deeper, so obviously they would'nt be as close to the face as the rear, but now I am wondering if I need longer lugs to put the lug nuts on.

and I will apologize now, I dont think they are called lugs, juts dont know the right term.

 

Thats happening because, front and rear are different width and lip size, everything is ok as long as you have right lug nuts and dont use spacers as i have the same wheels and never had problems with OEM lug stud lenght, You should be fine, sent you PM