1996 GMC rear sway bar too big?

[rauto13]

I asked this question in another area and did not get much response, so I thought I would ask here.

I have a 1996 GMC C1500 ex-cab pickup, it has a 1 1/4 front sway bar and I have what I think are two rear sway bars laying around the shop. One is 3/4 diameter off I think a 94 Camaro, the other one, I am not sure it is a rear bar, I think it may be, but it is 1 1/16 diameter and I have no idea where I picked it up.

If I could adapt either bar, which one would be better? I tend to drive a bit spirited, but I am not looking to turn it into something that would out handle a new Vette either. I do pull a ski boat with this truck occasionally and would like it to feel a bit more settled when I am towing.

Is there any reason I should not try to use the bigger bar?