Roys comments basically say it all and should be incorporated in a draft letter that can be sent to the teams.
This should be done sooner rather than later to give the teams time to sort out items or offers etc.
We also need to work out what teams to approach and i would suggest the bigger teams like Audi, Peugeot, Dyson, Penske, AGR, Corvette, Flying Lizard and Risi and any teams that actually race at Le Mans. Mention that you will be dropping by to speak to the teams in person at Sebring and then hopefully some teams may have something prepared for you in advance at sebring.
I am willing to help out going around the teams with you at sebring. As already mentioned i planned to get a 30 " x 20 " print done of the No. 4 corvette to take and get signed for the auction.
Regards
Chris