Modular polo mallet head design

So the original order is:
6- 60mm X 5.5" singles
6- 60mm X 5.5" doubles
3- 50mm X 5.5" doubles

Lucky can do this:
4- 60 X 5.5 singles
2- 60 X 6 singles
6- 60 X 5.5 doubles
3- 50 X 5.5 doubles

So if anybody who ordered a 5.5 inch, single capped head would swap their order for a 6 inch, single capped head, we could go ahead with this. He's not sure when the next batch will come out. They will be £12 a head.