The original return line is barely long enough. If the driver's engine mount is broken, this line will probably pull off, so check it. Adding a filter & a short hose would eliminate that problem. In any case, adding a filter (Raybestos Magnefine 3/8"
515554 or
3810000) is a wise move:
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That 15mm nut held the van wiring bracket. It's a crimped nut, so it shouldn't vibrate off, even though it looks loose. It's not needed, but it'll keep knuckles away from the stud threads.