Removing a non-AC Heater Box

[bill70j]

Can you post a link for the one you got?

Here is a link to replacement Heater Core on the supplier's website. I didn't buy it directly from them, but from a re-seller.

Edit: Funny. I just looked at that link and I see that OER advertises the tube diameters as 5/8" & 3/4" vs. 1/2" 5/8". At least my re-seller got it right on his listing