No problem. My avatar picture shows the GTR with the TX500 front end installed. I think it was 2013 that my dad and I did that swap. It was a one afternoon affair - very easy.
The only thing we had to do was go to the hardware store to buy 4 large washers to take up the gap from the longer TX500 triple tree.
The bike is a "roller" at this stage of its life.
I still haven't done any repairs to getting the pea gravel out of the crankcase on the left side or installed the repaired and coated cylinders from Millennium Technologies.
The front brake piston and cylinder will need to be overhauled as the TX500 I got it from hadn't been ridden in several years.
But either the TX500 or TX650 would work. Another nice option is the front forks already have predrilled bosses to install a second disc brake if desired. Doubt I'll ever go to the length.
I'm not even sure I'll do the tapered roller bearings, but remembered reading others wanted to try that upgrade. I hadn't realized the 175 and 350 shared the same front head bearings as Karl mentions.
This is a link to 2013 when I pulled it out for photos with various body parts hanging on it.http://bridgestonemotorcycleparts.com/index.php?topic=3112.msg15709#msg15709
Now that I'm in Arizona I'm more afraid of retread tire bits on the highways than deer.
Now where'd I put that winning lottery ticket so I can stop dreaming and start doing?