These distributors have been shortened in order to allow the distributor to be installed and removed without having to remove the head on a 16v conversion. In order to clear the 16v head these still require the use of a "crab cap" We no longer powder coat these. CORE REQUIRED! I no longer have a reliable source of cores for distributors. Send me yours and I can modify it. If you still need yours, purchase one off of ebay and ship it to Yoshifab.