The T1E3 Mine Roller conversion was produced by Verlinden, that's the only one that I have heard of.
The Crab flail has been produced by Resicast and I think a compnay by the name of Koree (Coree??) also did one but I can't be 100% sure of that.
Not sure about the bridgelayer.
Happy Modelling and God Bless
Robert