I would bet that the after markets are more interchangeable than what you might order from Glock OEM. There was a question posted the other day on the forum asking if the stock guide rod from a 17 would fit a 23. I believe that the guide rod lengths are the same in the mid to compacts maybe not the sub com-pact models. (I have not seen the dimensions yet for comparison) The only thing I would be concerned about is if the springs were the same tension and would cycle without problems. My guess is the after markets have more than likely optimized this so yes they would be fine. Let us know what response you get from the company.