Basket Strainer question

I recently had a job where I had to replace a basket strainer in an old cast iron kitchen sink. The sink base dipped too low for a basket strainer to fit and the pressure cup covered the threads, meaning I couldn't connect a tailpiece. I got a basket strainer from a local supplier that had longer threads for the tailpiece connection and this worked great, but when I asked if I could get one to stock in my truck the supplier told me he made it himself and it wasn't actually something they sold. I'm wondering if anyone know if these extended basket strainers actually exist or how to assemble one because it saved my butt on that job. Hopefully I've explained this well but if I'm unclear I'll try to explain it differently.