99 S80 Dipsticks and other parts

[Audie1966]

I am looking to replace my dipsticks, oil and transmission as well as the oil filler cap. Transmission dipstisk top end broke while doing the trans shifter cable change. I am having trouble finding these parts new. I also need to find a replacement for my parking brake boot as the little plastic latch broke while changing the shift cable. Also on the same task, the air cleaner latch on the left side as one looks at the engine broke. All weak old plastic parts. Old car. Brittle plastic.