I'd leave the front sight protector alone. Attempting to bend the ears back in place may cause more damage than it's worth.....I've seen this first hand.

Your Enfield has received a few parts over its lifetime. nothing wrong with leaving as is!

Is B18983 a correct 1941 Maltby serial number. When I look it up it shows 1942 Fazakerely. 1941 Maltby suffixes known are "A", "E", "F" and "G".

Ron