I went to back to the parts book and manual (plus Kevin's pics) and here's what I think. The first Mk. 1* carriers had the elbow and copper tubing running along the inside, right angle iron of the engine cover held on by clips. When it got to the back it was bent 90 degrees down, through one more clip on the rear plate (attached to one of the W/T battery box bolts I figure) and out the right hand air hole. If the rad sucked the overflow water in the tube back, great...if not it was spilled out the back onto the ground. Attached are pics 1 and 2 that show the tube assembly in the manual and where I think the tube would run.
From serial 12106 (says the parts book) the tube went to a condenser can with an adapter. From the pic it looks like a standard 2 gallon water can and cap with a fitting to take the pipe. Pics 3 is from the parts book and pic 4 is my best guess how the pipe would run. If this is correct it may imply carriers starting at serial 12106 had the extra racks on the back for water cans.
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