If you can't be bothered to cut down,
Zed Parts do a variety of different size JIS stainless bits.
I've just done the same. From what I've listed, the bits are as follows:
M6 40mm x4
M6 50mm x1
M6 63mm x10 (Zed do either 60mm or 65mm)
M6 75mm x2
M6 80mm x2
That
should be all of the bolts inc. the two that are inside the breather cover, but check more authoritative sources first.
Incidentally, unless you've got the engine out of the frame you might struggle to fit the central bolts - those under the frame/coils are obscured from above when the engine is in the frame, so you'll find it hard to tighten them down. If the engine's in the frame, you're probably better off with Allen head bolts.