Yes, that's pretty common. A new seal won't help if the bushing is shot. The original was only 8mm long. The replacement from Mike's is 10mm long (better) but you can even put a 12mm long one in. That's what I do now. You can get them from McMaster-Carr for about half of what Mike's asks .....
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Here's a 12mm long bushing installed and as you can see, it sticks out a little .....
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But, since the pushrod seal has four little "feet" on it that hold it away from the bushing, there's no clearance issues .....
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