Timing belt job, gaskets???

[sileighty]

Hi everyone. I'm planning on buying an 87 325is. If everything goes according to plan, I'll own it next weekend. However the timing belt has no known history so I know I need to change it immediately, this will be my first time. I've been researching how to do this job and looking at the parts that I will buy. So far it looks like I will buy:

Timing belt
Belt Tensioner
Tensioner spring
Water pump (hopefully comes with gasket too)

Not sure if I will get the camshaft seals yet, but there are other gaskets that I'm wondering about. Looking at the diagrams of the area, there is a rubber seal and a timing cover gasket in the area, but none of the guides that I see mention replacing these gaskets.

#8 here https://www.realoem.com/bmw/enUS/sho...diagId=11_0405

#9 here https://www.realoem.com/bmw/enUS/sho...diagId=11_4302

So should I just reuse these gaskets and seals? What is their purpose anyway? Is it just to keep water/debris etc from getting into the area with the timing belt?

[E30SPDFRK]

#8 is an inspection cover, yours will probably be pretty old and hardened, but unless it's missing or you're restoring the car, you shouldn't need to change it. #9 doesn't get changed during the timing belt repair, and they rarely leak. I wouldn't worry about it.

Other things you should change while in there: the upper and lower radiator hoses, water pump-thermostat hose, fan clutch, and possibly the thermostat if there's no history of it. The belts are probably cracked as well, and there's no extra labor to swap them out.