I'm not sure exactly what these are called... we always referred to them as "battery covers." I'm talking about the small, removable covers that allow access to the battery and master cylinder (IIRC). About 10x6 inches, they install on each side of the hood into the top of the fender, very near the base of the windshield.

I took mine in for engine work and some brainless dingbat lost them. They swear they'll find them for me, but by that time cars will be replaced by hovercraft.

The local junkyards aren't providing much... anyone know where I can find a cheap set? Thanks!

By any chance are these parts properly called "inspection lids?"

http://www.zcarsource.com/content/p/9/pid/65031/catid/7733/Inspection_Lid___left__70_78___used

Inspection Lid. Here's the left one and check the site for the right side.

A lot of air gets trapped against the firewall. someone was making louvered inspection lids. This may help release the trapped air since it looks like your racing the car. It might not matter I don't know what speeds your reaching and if it would make a difference.

AHA! Thank you! That's just what I needed.

Yes, I'm racing the car and yes, air trapped against the firewall is a concern. We'll be doing 130 mph or so at some tracks this year so the louvers are probably a good idea. Thanks again.

I found the Louvered ones MSA, but they want a $300 core Not good for you:

http://www.thezstore.com/page/TZS/PROD/7BSA03/50-1451

This company below has them list for $70:

http://www.showcars-bodyparts.com/240z.html

Another thing you could look at to help at high speeds is the G-nose that Datsun made for better aerodynamics in the 70's

Here is a set on ebay with a $15 starting bid and no bids yet http://cgi.ebay.com/ebaymotors/DATSUN-240-280-1971-1972-1973-Hood-Side-Panel-Doors-/320636440977?pt=Motors_Car_Truck_Parts_Accessories&hash=item4aa76bd191.

-Mike