some coaxes would do the trick, but the mk2's can be a bit of a pain in the arse if i remember right, i tried some 10 cm coaxes and they were a bit of a squeeze (they may have been 13cms, it was long time ago, pretty sure they were 10s though) so id try some first, just pretend you want to buy some from halfrauds to make sure of sizing, they will be happy to let you try a set, ' before you buy!' they will come to your car with you, probably even do it for you if you want! then just make up something about having to go to the bank or borrow some money, ive done it loads of times!
