These engines were in a Ziroli P-38 which hade 2 flights on it. My buddy who built and flew this plane had passed away suddenly and his wife left me to sell his equipment. I do know he bought these engines for the P-38 since I had cut the kit for him (I owned and operated LasercutUSA) I had taken everything that he had for these engines that is why there are 2 sets of stand offs and 2 sets of mufflers.