I put in the side mounts, and i'm glad I did. There is more there than just vibration.
I will say that they may not be worth this much trouble though.
For me, its a 10 minute trip to the machinist, and about 45 seconds of his time, and they are out. He's done a dozen sets for us, and only one cracked. Its a risk you take. The whole thing from the dealer was 35 bucks, and he pressed that one out for free.
Any half ass machine shop worth its own weight in shit has to have a press, and they have to have some adapters to get to the right size. This guys shop is small, but you can't build motors without these most basic tools. I would keep looking. Any place that rebuilds motors and heads should be able to do this for you in a couple minutes for about 10-20 bucks.