There are some dimensions on this other drag rope thread, but mostly for the 6 pdr and the 25 pdr:
http://www.mapleleafup.net/forums/sh...ad.php?t=27265
Notable is the model number for one of the two available 25pr ropes as being no1mk1 model. This could indicate that the ropes were used on other pieces and may date back to earlier guns. The other rope model is no5mk1. The 6pr rope model is given as no2mk1.