Flywheel wrote:That swingarm on the T500 is off of a Yamaha Seca 400.

Part of what made the event a good show was the opportunity to chat with the owners about their bikes & the mods they did.
The swingarm on the GT750 was an easy fit that needed lower shock mount brackets fabricated & welded on.
The tank is from another bike & there was no room for a petcock with the stock airbox, so he used a manual Seadoo petcock mounted on the right carb.
Those sharp-looking exhausts are Jemco 3-into-3s that he had chromed.
I think you are right about the donor parts for the T500 being from a Seca 400.
Wheels & parts look like those in Seca 400 pics.
The owner mentioned where they are from but I don’t remember that detail at the moment.
The T500 has unusual pod filters & exhaust tips, but I didn’t think about asking about them.
—-
Was a good weekend for events.
This event was on Sunday, and Mods & Rockers was in Millville on Saturday.
Excellent weather and both were reasonable rides from your place.
Definitely worth considering for next year.