No thanks on the clutch, I'm set there.
As for the bracket; I'm not really even sure if it exists

, but the S4 n/a has a support bracket thing that bolts onto the driver side of the intake manifold and to the block, I guess to support that side of the manifold. It looks like the S5 mani has a provision for a similar type of thing, not sure.
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-Ted
-1986 Mazda RX7 Sport [DD/beater]: engine finally let go at 205k. parts car status.
-1986 Mazda RX7 base [resto-mod project]: S5 n/a swap in progress.