Axle pivot and radius arm?

[import600]

Where are each of these parts? I thought the beam that attached to the Ibeam and under the cab on the frame was a radius arm. am I wrong? thanks.

EDIT:: I answered my own question. haha. sorry.

Is there a place i can get a bolt to match the one that connects the radius arm to the ibeam? Its a 3/4 inch x 7 inch bolt. I went to a few harware stores and found a bolt that was the right size, but the thread only went down about an inch and a half. To use that bolt without washers the threads need to come down about 3 inches.

[390Nut]

no you are not wrong. The axle pivot is on the skinny end of the i-beam, opposite of the wheel/hub assembly, where the axle attaches to the frame bracket.

[FORDification]

...Is there a place i can get a bolt to match the one that connects the radius arm to the ibeam? Its a 3/4 inch x 7 inch bolt. I went to a few harware stores and found a bolt that was the right size, but the thread only went down about an inch and a half. To use that bolt without washers the threads need to come down about 3 inches.

Well, you could always just rethread the bolt to the depth you need.