I have been building a custom mod with various new units and alterations in the civilizations of RTW. The infantry and spearmen are satisfactory, but the cavalry lacks its finishing touches. My knights are fighting with old fashion spears that are way to short. How do I give them longer lances, or do I need to make a new version?

Behold the Knights! (scart, aren't they?)

P.S. Is it possible to create am archer with a Corinthian helmet and Lorica Segmenta?