The old rule says that if a collector doesn't want to say how much he paid for a unique item, it means he got it for free from some poor grandmother. :D
I did the same at the beginning, I bought replacements, but Wojtek is right, it's a waste of time and money, because you will still strive for the beauty of the original parts. You can exchange the ones you don't get
What do you think about it, I like the old grenadiers, they are unbeatable. https://www.weitze.net/militaria/22/Preussen_Pickelhaube_fuer_einen_Feldwebel_in_einem_Linien_Grenadier_Regiment__428722.html