spare tire carriers

From what I can see in the part numbers, below, there are three kinds of under-bed spare tire carriers:
  1. Without aft tank: EOTZ 1443-D shows to be for 1980 on, but as there was another (E4TZ 1443-A) from 1983 on, I suspect that E0TZ-D was 1980 through 1982 only - and these are for F100's through F350's.
  2. With aft tank: EOTZ 1443-C is for 1980 through 1982, and E4TZ 1443-B was used from 1983 through 1986 - and these are for F100's through F350's.
  3. Slide out: This was offered in 1980 through '82 and carries part # D3TZ 1443-A with 15" wheels, meaning for the F100's and 150's, and D3TZ 1443-D with 16 or 16.5" wheels, meaning F250's and 350's.​

​However, if you are looking around in a salvage those part numbers won't help you as they aren't stamped on the carriers.  I have two versions of the aft-tank carrier, and both are marked as shown below:
  1. ​One is marked E0TA-1448-FA.  It is 47 1/4" long, including the 2" "handle" on the end, has hanger holes that are 42 3/4" c/c, and the flat area is 25 1/2" long.  This is surely EOTZ 1443-C and is for the 1980 - 82 trucks of all sizes.
  2. The other is marked E3TA-1448-AA.  "E3" means 1983, so this is surely the 1983+ version and it measures 48 3/4" long, including the 2" "handle", and that pretty closely matches the "Approx. 49" long" stated in the catalog.  Further, it has hanger holes that are 44" center/center, and the flat that the tire touches is 27" long.  This must be E4TZ 1443-B and is for the 1983 - 86 trucks of all sizes.​​
And one final observation: Since it appears that in all three kinds of under-bed spare tire carriers there's one that is for 1980 - 82 and another from 1983 - 86, I'd bet that the holes locations in the frames changed between those two sets of years.  And that fits with the fact that the early aft-tank carrier has 42 3/4" center/center on the hanger bolts and the later carrier has 44" center/center.  In other words, the early carrier won't fit on a later truck, and vice versa.
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