These are the harder bushings. These do not flex or squeak if installed properly.
I always recommend zerks and install them on all of the one's we install here. I don't think you need to score journals in them but, it probably wouldn't hurt.
Sorry for the delay Neil... we only had two left in inventory when you ordered. These are in stock and shipping now.
This may help as well.
http://www.914world.com/bbs2/index.php?showtopic=79299Also, I recommend a sanding drum from McMaster to hone the center. Much more precise fit than what was written up years back. Item #4650A68. Well worth the $5.84