MVS six slot from one slot

I own a one slot cab with a standard jamma, I was told by Video Connection that all I need to do is reqire the speaker connection, to install my six slot.
They actually sell harness kit. (20.00)
Any one else no anything different. i don't want to ruin my cab or new six slot!!
Theworm2@aol.com

you won't ruin anything, but the test button is located differently too, for example.

check here: http://www.classicgaming.com/neotokens/hardware/2slot.html