The diagram calls for attaching two K1000-4 plate-nuts using AN426AD3 rivets. This appears to be inconsistant. The holes in the plate-nuts clearly fit -4 rivets. The prepunched holes in the spare are for -3 rivets. It seems that if a K1000-4 plate-nut is call for, -4 rivet should be used. What am I missing here? I am somewhat concerned because the first hole I drilled to size was for a 1/8 rivet going with the spec on the plate-nut.