Nikon G lenses, aperature ring adapter?

Quite a few years ago I had all my fully manual film camera gear stolen. I then switched to digital and currently have a collection of Nikon G lenses. I want to get back into shooting film and bought a F2a and an F4 on ebay. Does anyone know of an aperature ring adapter which will allow me to attach an Nikon G lens to an F mount and give me F stop control on a G lens?

Added (1). Or do I need to get an F5 or F6

There's no adapter to use G lenses on bodies without electronic aperture control, but you don't need an F5 or F6, unless you really want to spend a decent amount. I linked a chart that shows which cameras you could use; basically most autofocus Nikons should work, including the cheap plastic entry-level ones. However, you should check your lenses to make sure they're designed for full-frame cameras, otherwise you will get vignetting from the smaller image circle (DX or APS-C sensor)