The vittessa range including the T has it's own filter mount, so unless you can find some Vitessa baynet mount filters from classic camera stores or flea markets then I suggest you do as I have done for the last 20 years or so that I have been using many old/classic cameras and that is to use Blu tak or similer sticky putty to mount the filters, I have one set of filters,(Yellow and Orange) and use them on all of my cameras, including both a Vitessa folder and 2 vitessa T's, If I had filters to fit every camera I use then I would hundreds of pounds invested in filters, in that position Blu Tak is an essential in the camera bag, The Vitessa T is indeed a fine camera, I have two and prefer to use them to my Leica £c, I have the complete set of lenses( Skoparet 35mm,Dynaret 100mm,and the super dynaret 135mm, plus of course the 50mm color skoper, they are all fine lenses, and the 135 is tiny compared to any other 135 that I have for various cameras, and a joy to use, I also have a Voigtlander turnit 3, which is a marvel, covers 25,50 100 and 135 lenses in a compact viewfinder that you turn and flip to get each size, and each one is lifesize, I have just had a look at my T's and they suggested size is around 40,5, if you can find that size it might fit, but I still suggest the Blu tak works fine and I have never lost a filter yet
Richard