I'm gonna guess that those are the RH-5 Widow Makers. That's based on THIS and THIS
But one of the Big Bolters that would be more familiar with them will chime in to confirm or deny my guess.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.