If you look closely at the rack + barrel, you may see the no on the barrel face, check the rack it self are there any makers mark on it? Look on EBay or any Fords Site type in The Make Model of your car there is every chance that the rack that is on the car will show up, was the rack on when you bought the car? if so contact the last owners and ask them where the rack was purchased. before going down this road dip the keys into some copper grease & work into the barrel or WD40 the barrel may have seized up.