Fan Adapter 80mm - 120mm
https://www.thingiverse.com/thing:4836100

Fan Adapter 100mm - 140mm
https://www.thingiverse.com/thing:4836100

Fan Adapter 100mm - 140mm + Fins
https://www.thingiverse.com/thing:4836142

Fan Adapter +Fins 120mm - 140mm +Spacer
https://www.thingiverse.com/thing:4836259