These are made in batches and available as theyre made. So, they will be out of stock at times. A length of extension needs to be chosen with the order because these have to be built onto an extension. The extension comes with the appropriate adapter for your shift base. No other adapters needed. The silver valve works Range and the splitter up top splits the gears for an old school driving experience. *Pictured shifter base is for demonstration purposes only and not included.*