i think highly overpriced. but then again, that seller is always very high. the rear trunk panel is very rough, it takes 1.5m of the new elephant skin to make that panel, so that is the price of the new skin.
the original wheel arch trims are available, but different material + slightly different, these are difficult to find in great shape, and are generally very brittle. the one that goes between the arch and fender is not currently made, so if you don't have one of these its worth finding.
the gas tank cover looks to be in good shape, but then again, they generally are ... its the spare tire one that is always broken