Leadmaster's bullet heads (bullet heads are also called grub heads in many parts of the country) fit most of the grubs made for fresh water and the smaller saltwater grubs. Leadmaster also makes really large grub heads, but nothing in between. To get the in-between sizes, check out the Sea Striker heads. Why one company doesn't make all the sizes is a mystery to me, so we solve the problem by carrying two brands.
If you've already clicked over to the other pages you have noticed that each group has their own set of colors (if any). I guess it is not critical that the same colors are available in each group of sizes, but it would make more sense to me.