what dia t bars should I buy? & what shocks should I get?

It sounds like the car is is either riding on the bump stops or has bad shocks.
Bad as in failed or too much high frequency damping.

The rst is what folks have posted.
Front sway bar for reduced roll and up the t-bars.
This assumes the rear springs aren't busted or shackles at some weird angle.

Then there's roller rim micro tire problem but can't imagine you did that.
But tires can make a big diffrence to ride.