Saddles in Cat SX
 

Just need the servo locaters U3569 to fit saddle packs lipo's in an CAT SX?

not sure of that part number...

I used an atomic carbon lipo cradle and double sided taped them together so the front saddle didn't eject from the car during a knock (when running without the undertray). If you need to keep splitting them velco may do the trick.

of course if your saddles have locators on them and you use the SX2 chassis you shouldn't need any I mentioned just hold them down tight and they won't move.