What sits behind ignition barrel?

I have a Ford Falcon Panel Van (1991) and have been having problems with the ignition. At first I thought it was the ignition barrel, so I replaced that, but the problem has occurred again. What sits behind the ignition barrel and is it replaceable?
Sarah, April 2007


done
hi
my husband would like to know how do you change the ignition lock on a ford transit van 1997 model
thankyou

shree, December 2007
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