560SEL Sway Bar Mount Repair

Have an 88 560SEL with a driver's side sway bar mount that has pulled away from the fire-wall. I am told by the local MB dealer that this is somewhat a common problem on this particular chassis and that a patch-panel/mount is available from the factory for repair. It was explained that leaves typically blocking water drain holes in the pan between the inner and outer fire-walls causes some rust to form in the area of the mount resulting in it tearing away.

Can anyone confirm how common of a condition this may be and a source & part number for the repair panel/mount.

How about any tech tips on executing a repair of this nature. It appears that the brake, steering, and fuse panel components need to be R&R'd to get to the mount. I am a pretty ambitious DIY'er ..... any tech help would be greatly appreciated before I dive in ? ..... Thanks.