Unlike child support, spousal support is often very difficult (if not impossible) to modify after the divorce is final, so getting it right the first time is a must!
Here in PA the local courthouse has your decree and if you show them your license they will copy it for you. Obviously it would be spelled out in there what they get, if anything.
Other than that that, how about calling your pension board or whoever rules your retirement and ask if there is a QDRO on file?
-------------------- call me WWIL...PA resident 39 year old , married 11 years, together 12...splitting in 13th year.