I have one helmet, Rudi has one so we aren't driving 8 hours straight...you can always borrow one of ours...unless your girl wants to go every lap. bring a skull cap or some kind of hair thingy if you are borrowing a helmet. I paid something like $200 for mine. See if elsabor has one to borrow.
To get ready i upgraded my brake fluids, installed titanium shims on my OEM pads/calipers, upgraded to stainless steel lines and installed my track tires....i brought a jack, 4 tires/wheels, a torque wrench and basic tools.
This time i 'll have my upgraded BBK and a 4-point harness (thanks a bunch to Rudi)...no engine or cooling mods yet but am thinking about an intercooler before i go.
My instruction came by way of €200 to Jaap van Laugen, a Porsche cup driver. But i don't think he's coming back. You'd probably do good riding with Rudi first couple of laps as he's got the most time at Spa.