I changed over the subby to a slimer one...fits like a glove now..other one was to bulky....and the new one has those bars across the speaker , i wouldnt want a "pram wheel going threw it"...
Those metal hooks that you can see on the left and right on the floor that are bolted actually have come in handy ! I use a strap like elastic cord thats around half a meter long, like an "okky strap" that loops threw one hook and wraps around the subby and loops threw the other hook, its fasten pretty bloody tight, it goes over the top metal bar.... i took it off for the pics...ill post a pics up tomorrow with it fastened...
The subby is completely removable in case i need remove the boot floor...
heres a pic of the fastener, sorry for the dodgy pic..you get the idea..