According to Tom McPherson, who I gather is preparing a story on Oldsmobile professional cars for the Magazine, Oldsmobile was extremely active in the professional car field in the 1930s. They produced a chassis for the coachbuilders and even advertised in the trade magazines. Miller was a big user of Olds chassis in the early 1940s. After the war, if you wanted an Olds-powered ambulance or funeral car, you ordered a car from a dealer and had it delivered to a coachbuilder - National, Weller, Comet, etc. In the late to mid-1950s, Comet and later Cotner/Bevington had an arrangement with a local Olds dealer to supply their cars and ordered them through that source. After C/B was bought by Wayne, the Corporation cut a new deal with Oldsmobile to be able to obtain de-contented cars directly from tyhe factory but, the orders stil had to be placed through a local dealer. Oldsmobile began listing the numbers of "chassis" shipped in 1964 - for the first time since 1942 - and, it is highly likely that the bulk of these "chassis" were shipped to C/B. McPherson has numbers for these "chassis" shipments for 1933 through 1975 but, wouldn't reveal them to me saying they were to be pubished in the Magazine along with his story - sometime in the future. However, I believe that he did answer the question.