I have the NewEra ones here and here. This things are thick. I have some huge rocks in back yard (look at my gallery) There are a few scratches on mine, something the stock plastic ones, I'm sure couldnt handle. They do add a little weight to the Savage, so you might want some stiffer shock springs?
I'm pretty sure they are thicker than the ones being sold on ebay.
Oh one more thing, these actually cover the stock skids, they dont replace them.
When your on eBay, looking at the skids you want, highlight the website address on the top of the screen and right click and choose copy. Then come over here, choose reply to message, when typing message, right click and choose paste.
Then we can see which ones you are talking about That will help you more.