XBR plug spanner of choice ?

[onthecheap]

Apart from the plug spanner that comes with the bike does anyone have a preference for any particular after market one ? Reason I ask is that where my engine will sit in the Aprilia frame a standard one is of no use.
Another question - unrelated - all of the head parts of my engine are marked MK4 any significance ?

Thanks in advance.

[JOOLZ]

I use a Halfords plug spanner it has a T handle and a flexable joint so it gets into difficult locations easily. Dont know about the MK4 but a lot of my parts are stamped the same way

[fenrunner]

I use a old box spanner, ground down the outside seems to work ok.