93 D21 exhaust sensor

Need some help please, I had the exhaust replaced and the place that did it didn't have the sensor in so I decided I'll deal with it later. Here it is later and I'm trying to figure out where the heck this sensor connects! I'm looking all over for the male end to connect this thing but nothing, I followed another plug figuring they just cut the line but no deal. If anyone can help me out that would be great.

93 D21 v6 standard 4x4.

Thanks in advance.