A bit confused

[allen]

Hi guys need some help here, We are installing the rear bumper on dads car a 1930 Tudor the support arms measure 4 1/2 inches which looks to be 1/2 inch too long, call Tom at Snyder's only had four and half and five and three inch long ones, but tonight reading a restorers book saw were 30 should be four inches long, so do they not make the four inch any longer are do any of you know where to go and get them. as always thanks