I dont know anything about TPO's covers but speedymoto machines their covers out of a HUGE piece of solid aircraft aluminum. the ones that cover the entire clutch are made for protection as well as style. they've also got a few that are not vented at all and are ABSURDLY strong.
the corosion on your stock pieces is probably linked to your deteriorating rubber/general age, going with stainless steel springs and caps and an aftermarket cover will negate the need for that rubber piece (but a pressure plate will be on your shopping list asap.
![Grin](http://ducatimonsterforum.org/Smileys/classic/grin.gif)
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FWIW the speedymoto springs are not made by speedymoto but rather sourced from company that only makes springs (insuring the spring tolerances/durability is something best left to a company that ONLY does that) the springs may have a different gauge or length to the stock ones but they WILL be the appropriate strength for the application.
speedymoto also has an awesome rep for customer service and they're also small enough operation that they can do limited custom stuff if you contact them directly.