Slims,
I have replaced these o-rings on my sled. I have purchased replacements from MSC industrial supply. They are a viton material which works well with gas. I bought 25 for $12 I think. I have used 2 so far. The size on the package is in MM and it is 1.6mm x 7.1mm. MSC part number 31958820 or zmscv1.6x7.1 . I have some of these I could mail you in a envelope for nothing.
