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Roy,
All I can tell you is what I have on our '66 122S and '67 1800S (presumably the same as a '66), far as I can make out the stamped numbers:
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122S
Manufacturer: Svenska Flygmotor under license from ZF
Type: 250108
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1800S
Manufacturer: ZF
Type: 731855101
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Length of shaft from box to beginning of splines for the steering coupler is 14" for both. The fitting for the coupler is different (and I know the 122 coupler changed to yet another style by the '68 model year). I don't have the numbers handy, but I know the 1800 box has a quicker ratio.
Would the boxes interchange physically? Looks that way, if you changed the coupler fitting and didn't mind a change of gear ratio.
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