TR4-6 sill outer LH. This part is not a full length sill and only extends just under the front and rear wings.

These sills should only be used in race applications typically where a full cage is employed as the sill box is integral to the strength of the car in standard form and this sill will certainly not do that job. It is simply a cover panel so the car looks right.

This part is listed on the following page of the website, where further information and background reading may be found.