Tried stock, to short. I spent an hour at the parts store trying to figure out what it could be. The most we could come up with was a rn13210 which is a rubicon express part number that doesn't translate to any other brand of end. I'm finding that unlike a lot of aftermarket brands, rubicon express does not list a part size or rplacement part number for any of their products. Just seems alittle stinjie to me. So if your RE part fails on a trail in the middle of nowhere you'll have no way to be able to just run down to the nearest town and pick up a replacement part. And since RE is not open on weekends, better hope the RE stuff don't brake afer 5 on fri. I'm pretty sure I'll never buy anything from rubicon express again.