WTB - Spark and Gas Levers for 1914 American in Horseless Carriages (Pre-1916) Posted April 23, 2013 Alan, you've come up in the world. An American. Wow. Just picked up throttle and spark levers for my 1911 Warren-Detroit project off of ebay. They're aluminum and 7" across the semi-circle. In other news, working hard on the Model 70. Hope to get it into the paint buy by June 1st. It's crunch time if I hope to get a fire in it before then. I'll send you a pic of the Warren. It's a mess.