Boss part? I thought you could only wear these behind the ear. My first pair ive had that are behind the ear so this will take getting used to, apparently my right ear is small than my left causing the wire to slip off frequently. Im using those black ear frame things to hold them in place, feels more comfortable too. Also how do the tips get worn out? Sorry so many questions
Also commonly referred to as the nozzle, which swivels. Some people have commented that when they first tried to move it, it was quite stiff but eventually got it to move. I personally wouldn't touch the damn nozzle unless you really need to reposition it. This is because after about 7-8 months my right nozzle started to not stay in place, and I barely moved them as well. If you clean your silicon tips every week (or less frequently if you dont use them often) it will be a while before they start to show any signs of wear. Atleast I haven't had issues.
I have problems with my right ear, can't really comment if its small or larger than my left ear, depends on the day lol, it is certainly a different shape. That being said, i suggest the mediam silicone that came on them, the non foam filled blue ones, or the double flanges that came with them. I just got the vsd3s and the double flanges that came with them were different than the ones that came with my gr07be ( i preferred the gr07 ones, atleast from memory they seem different).
Also, ones that don't come with the gr07, even though they aren't necessary are the meelectronic triple flanges (if you can deal with the discomfort for a little while), the mosnter super tips have gotten some good comments and for foam the comply tx400. For the triple flanges and comply, you would need to use the stem of another pair of tips with the actual head of the tip cut off and apply them to the nozzle before putting on the tri flange or comply so that they will fit on the nozzle properly. You could push the foam all the way to the last ring on the nozzle and it would fit, but it isn't meant to work in that manner.
There is also a tips thread, http://www.head-fi.org/t/579151/gr07-tips-thread, but if youve found something you like, I would avoid going to it. I know I personally sunk a lot of time into it only to come back to the ones I've mentioned here.