While good straw-stuffed leather collars are available today, they need some defarbing to be appropriate for use with 1st Section.  Merrick's Custom Leather will remove modern clasps and rivets, stitch new end covers on the collar, and add the adjusting straps and hair-stuffed pad as per the originals.  Aside from making the collar more authentic, it gives you several inches of adjustment to help better fit your horse.  
*Each order is for one collar defarb on a (not wrecked or inappropriate style of) collar you provide.  If you still need collars, send a message and we'll point you to the proper ones to order.