Hi John,
Yep, I'm needing the cap and screen that sticks out of the top of the hood on a Oliver/HartParr 70. 1937 year. If you have the whole aircleaner and don't want to sell just the cap, I'll take it all. 
I've hade 3 replys, but no one will return my e-mail and I think they have mistook  the ad for a styled 70.
Thanx                                                         Larry
PS
Just read your post here. I 'm glad you checked up on the totals. Still can't figure out why so many favored them though.