Frame Connectors

I am thinking about geting some connectors for my 70 Dart. Has any body got a set of Mancini Racing's weld in kit? How are thay?

Also what ones do I need? Thay have 67-69 ones and 70-76 ones. I would think the 70-76 but then thay might be for the 108 wheelbase car and that means I need the 67-69 ones? I wish thay would be more clear about it.

Thanks,Russell