Used Western Star 39.62 Polished Aluminum Battery Box Cover – P/N A06-78383-203. Used Western Star 39.62 Polished Aluminum Battery Box Cover. Used – Signs Of Wear. Cover – Battery Box, Lid Combo, WST, 2010T, 20. High Gloss (Polished) Finish. Overall Length: 39.62 (1006.32 mm). Overall Width: 16.56 (420.63 mm). Overall Height: 12.75 (323.89 mm). Diamond Plate Length: Approx. Compatible w/ But May Not Be Limited to Some Years/Models of the Western Star 4900 Truck – Please Verify Fit w/ Your Truck. May Have Cosmetic Blemishes. See Photos For More Details. We do not have the means to cross-reference VINs; therefore, for part fit specifications, please contact your local dealer. Be sure to check out the rest of our store. We have a huge selection of discounted new and used truck parts. Listing and template services provided by inkFrog.