need help oil leak!!!

[87 jimmy]

hey hows it going, i need some help. i noticed an oil leak coming from my 87 jimmy (full size) 305 auto trans 4x4. i looked under and saw that the leak was coming from some type of return line above the oil filter houseing, the part is black and looks like a cone shape. have no idea what its called. and was wondering is it possible to fix or do i have to replace it and how do i go about replaceing it. thank in advance can take pic's if needed

 

[Disciples Performance]

oil cooler lines or possibly the oil cooler line housing itself could be leaking possibly pics would help