Hello Mary,
First, why would you want to buy your parts from anyone else other than a Honda dealer? If you buy original parts from anyone else, they've only purchased them from Honda and are reselling them to you. Also, if you buy an aftermarket part, you don't always get what you paid for.
For your front brake fluid reservoir, go
here and look at part #6. As you can see, there's a price listed for that part which means it's still available from Honda. Lucky you. If you see a part with "Call for Price" in the price column, that's 'Honda speak' for "We don't make it any more." For your exhaust gaskets go
here and look at item #1 and #5. Again, lucky you, they're still available.
May I suggest that when buying from a Honda 'On-Line' dealer, always buy from
Western Honda of Phoenix as they consistently have the lowest 'On-Line' prices of any Honda dealer. (In the link above, note that I've selected the page for your year GL.)
When you buy from Honda, you'll find that their shipping isn't always inexpensive. So, when making a purchase, consider picking up several other small items to offset the shipping e.g., plugs, fuel filter, fuel line etc.