On the spark plug wire dust cover, there's a guy who is repopping them, and he sells them on ebay. I think his company is Yellow Engine Service, or something like that. I bought a set from him a year or so ago and they were very nice. Those would be the ones to get, rather than try to make some other brand or type work.
Also, SOHC crank spacers are the same as stock FE crank spacers. I'm not sure I understand your question about the timing chain/gear; can you explain further?