I've studied that link many times, and it mentions mushrooming the boot, but it still won't fit on the cup. It ALMOST looks like the old metal shell is still attached, but I tried hitting it with a screwdriver and hammer, but no movement and I dont want to damage it without knowing for sure.
I dont know if the old metal shell is just "fused" to the cup and its incredibly stubborn to remove or something?
Here's a closer look at what I am dealing with:
I got the boot kit directly from EPC for the part #...