Since your truck is a 1991 I took for granted the electronics would be the same, hence the 2 number CELs. The single # CELs can be from an earlier electronics set, like '85-87, so my mistake. IF you are in CA that will not pass muster for the smog program for a conversion.
I also take for granted whoever did the conversion knew what they were doing, check all the work. Are there a lot of cuts and splices in the harness?
If the electronics used are indeed early 22RE you might want to look into getting the later, '91-'95, electronics anyway.
