68 Cuda and USA Car Tool Sub frame connector Question

the emergency brake cable will pass thru the drivers side, but the pass side is the same also ., maybe a giant fuel line :)
It seams like a whole lot of stuff could collect in there and cause problems down the road .
They make a set for the 67-69 A bodies and another set for the 70 and up .
I have my receipt and its part # USCT0008 67-69 A body