Well, if you aren't comfortable doing it...don't. Pulling a tank from a junkyard is a crap shoot. Basically, you can use any tank from 79 to 93. JY tanks are an unknown as far as rust. New tanks average around $250 plus shipping. They are large so it's extra for over-sized package. If your mechanic can't find the part I have to say that's pretty sad actually. Google "Volvo 240 gas tank" and you'll see what I mean. If you pay to have the swap done, it would seem prudent to use a new one. Here's about as cheap as it gets...and free shipping!