I just completed this job and it was pretty easy. My old heater core slid out nicely which was a aftermarket heater core. I ordered a new heater core from eBay and when I got it I noticed it was about 5mm wider and better looking than the aftermarket one that was in it. All the pipes were the same. When I went to slide it in the heater box it wouldn’t fit. The ribs that hold the core in inside the heater box were too narrow. I had to grind away the ribs with a dremmel die grinder. Once I ground them away the wider heater core slid in. The core is originally slid in from the top once the heater box is split in half, so if your heater core is the wide one your probably going to have a hard time getting it out. Just prey to god that your old core is a narrow one otherwise your going to have a hard job of getting it out.
