For those of you interested, the Enzotech MST-88 is a very snug fit, too snug infact for my liking as the sides of the heatsink had to be squeezed into place on either side. My solution was to turn a belt sander upside down and; holding the heatsink firmly in my hand (i would have used a milling machine but the shape and softness of the copper made it hard to mount) sanded a little off each side. It now fits into place without touching anything but the mosfets.
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