According to the Tech Archives, axle lengths 8 3/4, a 65-67 B Body axle is 28 7/8" and an E Body is 29 31/32". This makes an E Body axle 1 3/32" longer. I don't think the buttons are as long, so leaving them out still wouldn't help. You could cut the axles down, or better yet, get a spool. Most spools are splined right through, so there maybe enough room. You really need a spool anyway...