You're right, it is ESU's page. It's a while ago I went looking for those files and couldn't find them on Kato's site. Forgot where I found them, so bookmarked it and then forgot whose page it was. Convoluted eh! Thanks for the updated link. My friend didn't tell me where he got the file from, just that he could change it. He mentioned the Full Throttle update the other day and said he'd done some of his, so I presume it was from that ESU page.
When I bought the HTC One M8 speakers W/enclosures, I got 6 from a local seller, whose ad said they were original equipment, I questioned and he confirmed they were (paid about $5 each for them), I also bought from another international seller the same type which also claimed original replacement (not questioned). As far as the actual speakers are concerned, they look identical to the one you've shown, for about $2+ each (bought 10), as do the casings. After doing that test using the $5 one, I bought some without the enclosure. The listing showed the same illustration of the speaker face as the others.
What I noticed with the first 2 lots was a difference in the appearance of the traces. Identical shape, traces and ends, except the $5 ones had more height i.e. they are cranked up, which would, I imagine exert more pressure against whatever it is in the phone they contact. The cheaper ones lay virtually flat on the casing. I found what I take to be serial numbers on the back of the casing near the speaker (could only read with a magnifying glass), interestingly the $5 ones had individual numbers, from the same letter prefixes, whereas the $2 all had similar series letter/numbers, but all totally identical to one another.
The non enclosed speakers, after waiting eventually 6 weeks or so and contacting the seller a couple of times. I got a refund for non delivery, on the understanding I would reverse refund if they did turn up. They did so about 3 weeks later. Trouble is they weren't the same appearance as the others. All came in seperate plastic bags and in individual little plastic containers within. Obviously cut from a strip of these little containers The front face looks just like the back i.e. a flat metal piece. Has a piece of blue plastic stuck on with a tab to remove it as a seal. I would have sent them back, but as they were all only $20 free shipping, what's the point? They might be OK, won't know till I get a chance to test one, but that's not a priority. Maybe the plastic front on the others is only a cover, but it just proves, ebay pictures are no guarantee.
What I did with the traces on the one I tried, I scraped the insulation coating off in places on each, staggered, so as to avoid the possibility of cross soldering (hopefully), pre-tinned, then after soldering the wires to each, cut down the middle to seperate them further and clipped off the excess. What I should have done, was slip some heat shrink over each joint. I've still got it with the wires attached, so I'll do that and try again.