The best thing about the BT is it's on a ford e-350 or 450 You can get parts anywhere.the light pops out super easy.You can even find videos on y-tube showing you how to do it. Buy some new ones for about $30 dollars $20 more gets the side lights too. and while you have it open time to change the old bulb.
https://www.amazon.com/Evan-Fischer-..._t1_B008H7CWRM