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I have literally tried 10 different types of LED bulbs in my car throughout the months and this website I found has the best product. I personally got Green LED for all my lights and they are incredibly bright compared to anything else I have used or seen on the market. http://www.superbrightleds.com/
To my knowledge yes. The only exception is a type of bulb used in the back of the IS250's its called a Festoon (looks like a tube with 2 end points that slip into the '+' '-' holder). They have different lengths (is250 stock is 35mm) so have a ruler or something with you. There are pretty standard sizes though. I dont think you will have a 36mm, think its more units of 5 or 10 so its obvious.
My best suggestions is look at the price. LED lights are proportional to price most of the time. I paid $6 each for a 5 sided LED 194 bulb (one in the dome light). If its too cheap then its probably a POS. Always look at the picture before you buy. Make sure its the ones with a circuitboard type of material.