I just went through those pedals on my wife's Raleigh Colt (1976?) Being British, wrench sizes are different though a 15mm thin cone wrench worked perfect on mine. Measuring mine the stubs appear to be 14mm diameter with a 1.25 thread.. They seem original to her bike and have the Raleigh Heron logo on them as well as the arms. I would get the blocks and relube the ball bearings in them. They come apart and are easy to clean and lube. If you do rethread, hope you have the correct drill, tap and feel for it and remember one is a Left Hand thread.
Last edited by Greg R; 10-23-21 at 09:08 PM.