The will fit The solido and the old Corgi. I have not tried them on a New Corgi T-34, if you have one send me a shot of the wheels with tracks off.
I could send you a sample of two pieces to test fit.
I am trying to get a Corgi T-34 to have a go myself.
The one in the picture is the 1970's SU-100, one of my favs.
They will be in sets of 80 links, enough for two tracks and some spares for the hull I am pricing them at the moment.
A SU-100 I did before I made the new tracks.