Made at the request of STPrime, these are a set of accessories meant to go along with my previous item, the Siege Ultra Magnus Thigh Extenders, that wrap around Magnus' existing leg and the extender, and give his legs the details that the G1 Ultra Magnus toy had. They also add extra detail to the vehicle mode via a small ladder, and gas tanks, which feature an additional 5mm port to attach weapons or other 5mm accessories. These plug into the "breather holes" on the sides of his thighs, meaning they also help stabilize the connection between Magnus' original leg and the thigh extender, however getting a proper fit will be slightly different on each figure, so you may need to do some trimming and/or filing/sanding down on the interior pegs until these fit on your figure just right.
For those who want a version that covers the entire thighs, and are ok with your figure not being able to transform as a result - a non-transformable verison of this item is available here:
https://www.shapeways.com/product/QYXMS4793/?key=120407776232bee233c607cafcf5641b