Welcome to the forum!

the injector return lines are a piece of cake. just need a needlenose pliers set and pinch the side of the lines, and they pop right off, then push on new hose. (click the buy parts link at the top of the page)
for the oil cooler lines, some have cut off the crimp, and replaced the hose, but it's hard to find 15mm hose... simplest is the replacement hose set from the buy parts link above, but it can also be taken off, and have a hose company (aeroquip, napa etc...) build you a standard set.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!