Hello,
I think your distributor is a replacement for the early cast iron distributor 0 231 116 046.
The number stamped on it probably ends in 007.
If you car is a late 230, it would probably have a vacuum retard 051 distributor and the replacement for it is an aluminum bodied 009.
Have a look in the 'wiki' under distributors. Vacuum advance and vacuum retard distributors are matched to differing throttle bodies and you need to be sure yours are matching.
Many Bosch coils do have a brown top. The differences are in the colour of the body, black, red or blue. Newer coils all have aluminum finish bodies but the differences are on the different coloured labels. Again, details in the 'wiki' under coils.
Hope this helps.
naj