Item #70522 - BB.  Our current lineup of battery boxes are the Kenworth T800 the Peterbilt 30, Kenwroth Advanced, Kenworth W900, Kenworth Retro, Mack  and the Freightliner. All these battery boxes come in either a one piece version or a split version. The Mack Battery Box #1 comes in a one piece. All Split versions come with two batteries.  All measurements are +/- 1.00 mm approximately.