Do these look like sway-a-ways to you guys? 1633 doesn't seem to match the model on their website but it is pretty close, maybe an older series?

 

maybe they are not sway-a-ways

I don't know if this will help or not but, I found a 1633 part number in an old rancho catalog for torsion bars (page 11): http://www.lunghd.com/Downloads_and_...shock_spec.pdf

1633 24MM 41.930" 619

according to the sway away there's are 41 7/8 long = 41.875

I also found a thread here http://www.dezertrangers.com/vb/truck-talk/105176.htm referencing the same part number 1633 and it seems as though they are also talking about rancho and not rancho etc etc. but this is also on a t-100 which there was an argument if the pickups were the same or not. You don't reference what you have so.