Add P-90 Hx to Mixed set of 3 tele/Strat pickups.

Add P-90 Hx to drop down menus for NECK and MIDDLE pickup (not the bridge) 

Cover color selection page to follow automatically if P-90 Hx is chosen. 

It might be that there are 2 cover selection pages that follow, for Strat and then P-90 Hx.

Change title to 
Mixed Set of 3 Tele/Strat/P-90 pickups