Help with spares for ignition system

[cheezels]

Hi
I'm having a really hard time working out what spares I need for my sons car, as we're not entirely sure if the correct parts have been fitted
Is there a spares archive/library one can access to determine the correct part numbers?
For example, one parts supplier mentioned that the distributor cap part number I gave him (taken from the cap fitted to the distributor, attached to the engine) is incorrect, suggesting the wrong cap is fitted
A parts website lists different bosch numbers for distributor caps, that "fit your vehicle"
Anyhoo, I'm getting a bit frustrated, so any advice, hints and tips appreciated

Vehicle is a 1975 280SE, D Jet, M110.985 engine (australian delivered)

Cheers

[Frank Reiner]

On the distributor will be found a Bosch identification plate.
Record the model #; it will begin 0 231 (or similar).
Enter that number in a search engine. You should be able to determine if the distributor model and the car year/model are a match.
You can then order spares by either distributor model, or car model.

[rumb]

Use this to find part numbers
https://nemigaparts.com/cat_spares/epc/mercedes/

use this to see if part is available from MB
https://partssearch.mercedes-benz-classic.com/