Flap rib to attach angle rivet spacing/quantity?

What are people using for the rivet spacing for flap rib to angle attach piece? I have not been able to search and find anywhere where this has been commented on. The Patrol drawings are not clear as far as I can see. Attached is the Patrol drawing of the side view of the flap rib and attach angle area. You can see 3 location cross hairs for rivets, but nothing else.. i’m assuming this is just another lack of drawing details or am I missing the call out somewhere else? For a similar reference, The Aileron drawing appears to call out 4 rivet locations.IMG_6600.jpeg

-TomIMG_6602.jpeg
 
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