Do you know for sure what that oil pan is off of; what year and model truck? The dipstick and tube need to be a matched set and need to match the oil pan. However, if the tube you have installed now is acceptable in appearance you could just a long dipstick that is reading too high and remark that dipstick with the known new level from the oil you added. Nothing wrong with doing that if you cannot find the matching parts.
I just measured the length of two dipsticks and tubes for comparison:
89 LA 360 Ramcharger (same as pickup truck): dipstick is about 34.5 inches from the tip to the top end of the handle and the tube is about 14.5 inches from block to the top end of the tube itself.
94 Magnum 5.9/360 pickup truck: dipstick is about 37.5 inches from the tip to the top end of the handle and the tube is about 15.5 inches from the block to the top end of the tube itself, although this tube has curves and is not a perfect measurement.
The Magnum oil pan from a pickup truck has a channel or guide for the dipstick to run inside of, so it goes down into the engine, curves rearward almost level with the ground, and then curves down again into the oil in the pan. Picture of the channel below. I don't have a picture right now of the inside of the 89 Ramcharger/truck oil pan.
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