Sig doesn't show anything 1 and1/8 on the websight.
http://www.sigmfg.com/cgi-bin/dpsmar...ntF.html?E+Sig
If nothing in the link looks right I would call them. A Sig airplane I had sitting around for a long time had warped ailerons. I called them,and they fixed me right up. They have a lot more stuff than they show on their websight.