I ordered a front and rear valve stem from HDL about a month ago. Finally the front one was shipped but the rear was backordered. I went to the local shop with my part number, but they didn't have the part number I had, but they had a stem which is a front part number, but they said it would work. I haven't broken the package, but if this is going to be an issue, I'd rather wait for the proper stem. Is anyone knowledgeable on the difference in front and rear stems??