I recently ordered the dumbbell holder for the Echelon Sport. When I received it, it was missing the bolts, I contacted them, they sent me bolts but they don't fit. I contacted them again, and they sent me the dumbbell holder again without bolts. I have tried the different bolts on the bike to see if any fit so I could take to the store and get some. No luck, none fit. Does anyone know what size bolts it uses?