Have an Audi 100 C4 gained me, in which, unfortunately, the standard radio was broken. Good and cheap bought a used Alpine at bay ... Classifieds. Just do not fit the Audi terminals to an ISO radio. Here ordered the adapter, hoping to solve the problem. Too bad, the red plug does not fit at Audi, because however the shaft for locking is centered, with Audi side. Thus unsuitable for older Audi models. Here there is only the adapter from the company. Dietz (SKU 17015 for radios with max. 4x 15 W output power (Price 19-49), or Dietz 17008, for radios with max. 4 x 50 W output power (price between 60 u. . 90) Ergo agree the statements made here, fit for Audi - 94 definitely not, it does not fit!