If you want to paint the upper plenum, this can be done in a day due to the textured finish (just start early or take it off the night before), no need to buy a spare. You don't need to use VHT paint as, although it gets (very) warm, it doesn't get very HOT.
Send ianphampton a PM as he was (and still is I believe) doing the full stainless bolt kit with anodised washers.