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Not sure why you need to know that. I have a 1969 also, and the transmissions are a bit flaky for that year. They are longer than earlier transmissions, but not sure the width or axle length. I am told the length is in the nose piece, not the main case. The easiest solution is to get a transmission from the right year, 1969. (1970-71 reversed the action on the throwout bearing, but can be fit in with a little parts replacing).
Aluminum cases for the first half of 1969 are number 902/04 and 902/05 for 4 and 5 speeds, respectively. (The 911 have 901/06 as 4 speed and 901/07 for 5 speeds and they fit exactly.)
The second half year transmissions are magnesium cases, and are numbered 902/55 (912 5 speed) and 901/75/76/77/78/79 are all for the 5 speed 911 cases. (The 911 cases have different gear ratios, but that may or may not bother you).
This info is from the factory release for the 1969 Model Year change, page 53. (Title is "Transmission modifications for '69 models." All have 7:31 ratio ring/pinions and no 1969 has limited slip differential. The factory says they have a "Modified half-axle flange for the larger LOBRO half-shaft." I think that refers to the diameter of the flange and not the length, but I never tried to fit an older axle into a1969-72 car.
If I come across an axle length I'll let you know, but all long-body axles should fit until the 915 transmission was produced, so look for for axles from 1969-72.
This may not be what you want, but makes for an easier solution. For parts, check with EASY or the parts farm in McMinnville, Oregon. (I have a spare set of axles in the garage, but measuring them isn't accurate, because there is play in the joints).
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