This was a dealer that got a air container in from Germany every day. They usually had a waiting list for replacement engines.

They didn't really like to stock large items since they could get them overnight.

And they didn't like to sell them to anyone but shops they worked with. You could buy one but you could have yours rebuilt at a shop for about half the price. For the general public there was 'special pricing' which discouraged do-it your-self types.