I bought a Miller "Stars & Stripes" helmet that has the battery cover missing. The missing cover is in the upper right hand corner of the AD filter and is about 1" in diameter.I'm hoping someone has an old Miller AD filter that was replaced and they might still have the old filter in the shop with the battery cover still attached.I've contacted Miller twice for information without success yet and I've tried to find a operation manual for the XL or XLIX helmet (I think it's the XLIX) but Millers website manual list needs a serial number I guess since all I'm pulling up is the Elite manual even though I'm clicking on the XL or XLIX helmet. I can't make out the filter serial number and I can't remove the filter to see it because I don't have the manual that describes exactly how to remove the filter to be able to read the serial number to be able to retrieve the correct manual (catch 22).At any rate if someone has a battery cover for one of these helmets,I'd like to purchase it. The helmet doesn't function without the battery in place. Thanks