| This is a new single port vacuum advance unit for all non turbo 280 ZX distributors. Most of the advance units for these cars have been discontinued. This model will replace all of them and it's a direct bolt in fit. For the cars that use a dual hose hookup you'll have to plug off one of the hoses and then this unit will work fine. The dual port advance unit that comes on 1 particular model is no longer available. We usually carry this item in stock. If we happen to be out of stock, then please allow an extra week for shipping. Last updated 10/11 | 
