Oh yeah. I posted long ago under my old username about my stems. When I bought the bike it had the Honda rubber 90-degree stems but the keepers were gone.
Same here. Had the tires replaced by the shop I purchased it from as a consignment. Yep unbeknownst to me about the keepers and new rubber stems 90 degree as no metal one's were available in the area of sources. 65 mph. on I65 2 up. Fortunately, I felt it losing pressure and averted any bad. It had started to tear just enough to cause a faster slow leak.

Good Karma that night as we was able to ride/move back down a exit to park at lit BP parking lot with the assistance of a NB Goldwing couple that came back down the SB to help, County Sheriff came by and checked on us and said he keep an eye on it thru the night and my wife's friend live 1/2 mi. away and took us home. Next morning a full air tank and two stops/6 mi. back to shop. Got a deal on keepers on Ebay until next changes.