Mike, I know of the 2 Details Associates un-coupler bars. They come pre-bent into the 2 different shapes. To mount them, you'll either need the mounting brackets from DA of use the metal lift rings. I prefer the metal lift rings myself. There is no one un-coupler bar meant for a particular engine. Look for prototype photos to make sure you have the correct kind. Here's a close up of one style.
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They're a division of Bowser I think. Here's a link for the page they are on: HO Cal Scale Diesel Details. The one I'm looking at is about halfway down part #190-522. They make the eye bolt lift rings as well. I may order some through the LHS and see how they compare to DA's. I was just wondering if anybody had experience with them.Brian, can't say I've ever seen theirs. I'll have to go look them up.
Edit: can't seem to find a picture of them, so hard to tell what style they are.