The most used component of any non-superautomatic espresso machine is the portafilter -- it gets poked, prodded, pounded, grabbed, tweaked and occasionally tossed a little too far. We know that it's nothing personal, and no reflection on your sentiment toward your machine, but these little suckers do bear the brunt of the espresso extraction process.
Picking up a replacement portafilter before you need one means you can keep the java flowing, even if you got a little too aggressive in your morning coffee ritual. We have a variety of replacement portafilters for several of the machines that we carry, and we recently reworked our Rancilio Silvia portafilter product to make it a little easier to customize it with different baskets and/or spouts.