Body mounting kit; 67-68 or 69-72?

[Greasey Harley]

I was just making up a parts list and ran into a hitch in my giddy-up.
I have a 72 2wd with a steel bed but I plan on using the front clip off a 67 c20.
There are (apparently) two different body mounting kits:
1) 67-68 steel bed kit
2) 69-72 steel bed kit

My assumption would be that I would need the 67-68 kit, since the only discernible difference between the years is the front clip (ignoring '67 marker lights and back window)

Which kit do I need?
What's the difference?

P.S.
I was using LMC website for parts reference.
67-68 Body mounting kit, Part Number: 30-1175
69-70 Body mounting kit, Part Numbe#: 30-0586
I don't know where I'll buy, I was just window shopping.

Thanks, Russ