Item 1 DA50 has run in a Pilot Sbach 87" for less than 10 flights and would suit a new motor purchaser. $999 at DA - https://www.desertaircraft.com.au/shop/Desert-Aircraft-Engines/da-50-r.html Selling for $650.
Item 2 mint (never used) KS86 canister. $265 at DA - https://www.desertaircraft.com.au/shop/Exhaust-Systems/Canister-Exhausts/Up-to-65cc-Canister-Exhausts/KS-86-VS-Front-Exit-Canister.html Selling for $210.
Item 3 Used MTW header to suit DA50 with 25mm drop. $89 at DA - https://www.desertaircraft.com.au/shop/Exhaust-Systems/Headers/MTW-stainless-steel-header.html Selling for $45.