Welcome aboard max maxrock from NH Where we just got "hell froze over" a couple days ago with 20"-43" of snow.... but we do have fresh maple syrup 😋
Yes we do read these.
As to your pictures getting lost and text gets lost, I've found it's happening from the pictures being too large from my phone set to super fine and they need resizing but I'm not a techie and don't know how to get and use a photo hosting resizing gig.....old dog....
Anyhow I figured out that if I screenshot my pictures before posting them it works to resize them to meet the forum(old school site requirement)picture size. Try it to see if that helps you. Extra steps either way.
Here is an old thread on how to get the correct main bearings from 2007. Read through the 2 pages of replies to learn from the experts, lots of good schooling doing a search on the topic you need information about, just put cb750 sohc in the web search and it will pick up the forum archives. This turned up in my search of "cb750 F2 sohc4 how to get correct main bearings" it'll usually work on any topic you need info on. I put in the F2 because of your 1st picture of the F2 frame?
http://forums.sohc4.net/index.php?topic=28774.0When you make a new topic post, include all information on what your bike is, year, model, motor etc so you get the correct reply information(just like you would going to get parts and they ask you what you have) and we don't have to pry it out of you each time. Too many members to remember who has what bike and motor.
I don't have a recommendation on a seat for you as I'm just a normal 5'10" and not a tall drink of water "giraffe" you say you are.
I've never heard of a "tuffside big honda seat" before. Do you have a picture?
A stock seat could have foam added under a new cover made by a local upholstery shop that does bike seats to help with your height. If you do have the original seat in good condition, I would suggest that you save it (for when you sell the bike) and find a weathered seat to rebuild to your needs.
You could also call Sargent Seats in Jacksonville FL to see if they would build you a custom seat for your size from your seat pan.
https://www.sargentcycle.com/Custom-Seat-Services/Overview/Hope that helps you.