Recheck your plans and see where the battery plate attaches section 10-23 with AN-3-5A AN bolts? Thats where you use the -3 K1000's. The bellcrank plate attaches to the ribs with 515-8R8 screws and K1000-8. The 4 each, K1000-4's are used to hold the master relay and the battery hold down bolts.
I have found it a good practice to jump ahead to the section where the part that would attach to a given nutplate is actually installed, that way you can see what the bolt/screw callout is and make sure you have the right nutplate. It has saved me several dimples and countersinks that would have been hard to do if I waited till after assembly. There are a few spots in the plans especially on the fuselage that neglect to tell you when to dimple or C/S I assume it is that way cause by then you should know better. Look in the manual at your hardware ID chart, that will help you make sure you have the correct piece as well.
Rick S.
RV-10
40185
Fuselage & Finishing