I have not been able to compare yet, however I am still in research mode. I finally got the truck up on the slab tonight so I can begin to take things apart tomorrow. I need to pull the wheels off to redo the brakes. I also plan to do the heater core at the same time. I'd rather pull the existing core before I order parts.
I looked at Rock Auto for a heater core for the C30 but there are variances in the pictures which led me to wanting to pull it first.
I will attach pics of my firewall and what Rock shows. I will also include a pic of a core I recently replaced on a 3rd gen Firebird.
