I think Safety Recalls have a much longer life.
I did discuss general parts availability with a Vauxhall Dealer yesterday and he said it was still pretty good.
I do recall having the Tank recall done in 1994 on my 93. From the pictures I've seen it looks like yours may not have had it done.
However, thats not to say, it was done in the past, and someone has replaced the tank with an old one.
The best thing to do is to get your Vin No and discuss it with a dealer to check it. It will do not harm.
I've had Ford US Safety recalls done in the UK for a Mustang, many years after it was announced.
Mark