Your minibike was sold as a VT3 because it is blue. VT5's were red. Same bike either way.
Your's does have the later design lower front forks.
All jackshaft parts are available except the bracket. You can fabricate that. I was going to get some bent up and bored, just haven't got at it.
I have a lot of Sebac shocks in various condition. Most of them are disassembled for sandblasting and painting. Cost to chrome springs is prohibitive. I was going to do them over the winter, again, didn't get at it.
Since I started volunteering to tutor 6 yearolds in Detroit, I don't get a lot of minibike things done. But, having a great time with the kids!
I have two complete VT3/5's and two disassembled. I can provide pics and dimensions of anything you need. PM me anytime.
My wife and I met you at Frank Mathison's a year or two ago. How time flys!