sleeves

I have dual HMF cans on my exhaust. The outer sleeve is made of aluminum and since a need to take them apart to repack them, I was hoping to change the outer sleeves to carbon fiber. I have been searching the internet and found very little sources for this product or what I have found is...

Does anyone know the differences between the white plastic vs black plastic...I assume spacing is different for cable hook up. Is black spacing further apart?