Steering box

Trying to work out if my steering box is early or a later version.
The bus was built Dec 72.
Can anyone direct me to illustrations/photos to compare?

 

Photo of my box.

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That's a late.

 

The early and XO one looks like this
Like Matey said your one is late

 

Thanks @Dubs and @monkeyvanwestybike .... will have to read all the relevant threads and try and source some seals as didn't think I had a problem when @Keith.H was selling them ! Should have known better!