Contact "SparkieSRT6," he recently made a batch of engine plaques, and may still have availability for one. They do look very nice, I purchased one from him as well!

Engine covers... try ebay.
http://m.ebay.com/itm/05-CHRYSLER-CROSSFIRE-SRT-6-TOP-ENGINE-COVER-OEM-1120100867-/141998553385?nav=SEARCH
Or possibly the parts and accessories "For sale" section within our forum.