i had the FX-r for my second retrofit and theyre impressive but never driven with them :( they have to be mounted by screws etc. so alignment is tricky. the morimoto projectors are like the ebay "screw on bulb hole type" with good performance. the FX-r is clearly the best performer but if i did another retrofit i would try the morimoto just for convenience :) also the morimoto small size will give you more room to play in the small corolla headlights. the FX-r's are big. shrouds are the chrome trim that covers the projector body. this is what makes a retrofit look oem if done right. there are many choices of shrouds with are short or long, circular or odd shaped, wide or narrow. most are replicas of oem headlight designs. for the preface jdm rolla with the half circle shallow reflector, have a look at the E46-r shrouds they would cover most of the reflector and is relatively shallow. there are nicer shrouds available so check them out. you have to custom add the halos to the shroud. ccfls will do the trick but have to deal with ballasts/inverters, leds will work but not as bright. since the jdm parker light is in a separate chamber, you don't really need halos to fulfil perking light duties. before doing anything make sure you do a lot of research on it. especially on the spatial aspects, that will help you choose parts most likely to fit your headlights for a successful retrofit.