Series 3 Parking brake.

Hi all me again, so on Sunday morning I got sorted to fit new parking brake shoes. When I took the drum off I found the shoes and inside of the drum were covered in oil. I take it that the oil seal between the drum and gear/transfer box needs replacing.
Is it straight forward to replace and if so which parts will I need please.

Thanks, Simon.

Ps, it's a 1982 series 3 2.25 petrol.

Can't advise on the parts needed BUT check the shiny part of the shaft the seal err seals against for grooving etc else the new seal will fail quite quickly.

There's a really good YT film on doing that job.