Part G-22 is the driver's steering yoke. This isn't listed as "unused" in this kit, but there are several releases which include the interior and it's there in some but not others. This part goes on the inside of the upper hull just in front of the driver's hatch opening. there is a little "U" shaped mounting guide for it.
The other parts you have listed seem to belong to another variant, perhaps the M1A2 (non-SEP), but the release of the M1A2 that I have doesn't have any interior parts at all. In some releases of the M1A1 kits with the "G" sprue, this section is missing completely and the parts simply aren't there.
That little section of the sprue appears to be cut off sometimes and left there sometimes.
This section wasn't on the G sprue in the 3533 that I built several years ago, nor is it in the 3531 I have in the stash, but it is there in the 3516 I have in the stash.
Note that whilst the turret bustle APU is included in the kit, the connector box isn't, so to make it a little more accurate, you may wish to scratch this part.
(not the greatest view but it can be seen here http://data3.primeportal.net/tanks/marc_peters/m1a1/images/m1a1_24_of_71.jpg and http://data3.primeportal.net/tanks/marc_peters/m1a1/images/m1a1_25_of_71.jpg)
Note also that the bustle rack extension included in the kit isn't correct for a USMC M1A1, though it is correct for an Army (specifically a 3rd Infantry Division) M1A1.