I have four Tactical Operations Products (T.O.P.) 6V Xenon Tactical Flashlights with black Zytel body (Part #LX6ZK2B). Recently, the bulb died in two of these flashlights, so I am looking for a replacement lamp assembly, preferably LED, but I'll also use another xenon lamp if that's what's available. I have been unable to find any bulb replacements that fit this flashlight. I bought this (https://www.amazon.com/gp/product/B07K1VM3ZV/?tag=cpf0b6-20) from Amazon, but it did not come close to fitting the flashlight. Any suggestions?