What are these nutplates for?

[FlyingDiver]

See attached drawing. There's two nutplates on the upper firewall, oriented to mount something inside the engine compartment. But I've been looking at the rest of the plans, and I don't see where anything gets mounted there. Maybe I just missed it. Anyone know?

 

[Bob Y]

Straps for mounting coolant overflow bottle.

 

[FlyingDiver]

Ah. Didn't think to look in that section. Thanks!