Since replacement parts for Senns tend to be kinda pricey I was thinking of buying some of these. Of course with all things cheap and chinese I am wary of getting something that doesn't even fit or I will have some kind of allergic reaction too.
 
So anyone bought any of these?
http://www.ebay.com/sch/i.html?_odkw=sennheiser+replacement+headband&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.Xsennheiser+600+replacement+headband.TRS1&_nkw=sennheiser+600+replacement+headband&_sacat=0
 
Thanks.

You said they're cheap right? Take the plunge and let us know!

I'd be careful about cheap replacement earpads. I replaced mine with genuine headband and earpads. Earpads were about £40, but at least I know I'm not changing anything about the sound.
 
Here's a recent review from someone on the forums.
 
http://www.head-fi.org/products/sennheiser-hd-580/reviews/13358
 
"Another issue with the HD580 is simply due to the age of the headphone and the amount of time people have owned theirs. The  headband padding and earpads tend to go flat and need replacement. I haven't seen a single HD580 for sale on eBay (other than unused NOS ones) that didn't have a flat headband and earpads. So when you purchase the HD580, new earpads are a cost you need to take into account when purchasing the headphone. I purchased an aftermarket HD600 headband from a retailer in China for under 3 US dollars, and it is almost indistinguishable from the real deal. So there is 17 dollars saved. HD600 earpads will work, but unfortunately they do not come cheap. About 60-70 dollars, maybe a little less if you can order them directly from Sennheiser. I found that aftermarket earpads aren't as good when it comes to thickness and build, and using Brainwavz earpads can make the bass too strong and shelve off the mids too much. So I don't recommend cheaping out too much here. 
 
Fortunately, earpads wear shouldn't be as fast on the HD580 as the HD600 and HD650, due to the fact that the 580's headband is a wider shape, and as a result it clamps quite a bit less."

svperstar said:

  Since replacement parts for Senns tend to be kinda pricey I was thinking of buying some of these. Of course with all things cheap and Chinese I am wary of getting something that doesn't even fit or I will have some kind of allergic reaction too.
So anyone bought any of these?
http://www.ebay.com/sch/i.html?_odkw=sennheiser+replacement+headband&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.Xsennheiser+600+replacement+headband.TRS1&_nkw=sennheiser+600+replacement+headband&_sacat=0

Click to expand...

 
Those low cost ear pads will not be as good as the factory ear pads, but they are still a good value for the price.
So try the low cost pads, if they do not work out, then get the factory pads.

I don't know about those pads specifically, but I bought a cheap set of Senn 518/558/598 pads off the bay that didn't fit or rather, they "fit" but wouldn't snap into place as the plastic bit was to small. They went into the trash and I just spent the extra on genuine pads.