This part is part of a kit that allows you to mount a DF01/Top Force rear transmission to a Grasshopper 2, Super Hornet or Rising Fighter in order to get independent rear suspension. For the full build details see this thread:
https://www.tamiyaclub.com/forum/index.php?/topic/101112-project-ultra-hornet/&tab=comments#comment-907020
For other parts in the kit, just fliter my parts for "Grasshopper2 DF01 Transmission"
I used regular SLS Nylon Versatile Plastic, but I added the PA12 option if you prefer.
You need to order the follow carbon parts from www.fibre-lyte.co.uk:
CTE RC Ultra Hornet Bottom Plate V1 in 2mm carbon