I attempted to upload the photos and it didn't work but my tank is larger then both tanks showed. When I get down to my boat I will have to measure the floor because the tank is literally the same size as it.
Back to the original thread question, everything we currently have here would indicate the factory installed tank would have been 120 gals. That stated, since the boat came with the optional I/O power, it could possibly have a different size tank. Assuming your tank is similar in shape (trapezoidal) and dimension as the 105gal. I posted, I'd guess your tank hovers around 6 1/2' long, +/- an inch or two.
If the tank is rectangular well...
Measuring the tank dimensions will let you know for sure.
Probably a good time (since it's original) to give it a good look see anyway. <!-- s:idea: -->
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EDIT: A quick search found this thread (of which you participated in).
http://classicaquasport.com/smf/index.php?topic=5679.0
Using the dims stated by member "Pilgrim2", his tank equated to 140 + gals so......
Not sure what's up with the photos. <!-- s:scratch: --><!-- s:scratch: --> The Gallery is pretty user friendly.
Can we help?