My suggestion is to buy the best parts you can afford for that job. You only want to do that job about once every 15 years. I'd go with original Ford parts, or NAPA HD parts. Autozone or discounters would be off my list.
When the job was done on my 86 back in the early 90s, the individual bent one of the heater tubes just a smidge to get it to fit. Guess where it started leaking about 20K later. So buy the best, and take your time doing the job right the first time.
T. Christopher sends...