dually sway bar

[dins1]

any body know what year dually had the factory sway bars.

 

[Brady]

My '77 crew cab does.Not sure what other years have them.

 

[R72K5]

how wide is the entire bar itself- at the ends- from end to end ?
attaches to axle tubes with U bolts ?? how bout to frame rails ?
pic ?

thanks
R