Hi Craig, I guess as you have a long stroke A7 that its the long stoke version of the carb to air filter rubber pipe you mean. The part numbers you have listed are for a later model. I got one for my 49 A7 from Jeff Hunter Engineering of 35 Sandgate Road, Hall Green, Birmingham, B28 0UN who specialise in reproduction rubber components to original specifications. They can be contacted by email jeffalanhunter@aol.com or telephone on +44 (0)121 745 1954. The original pipe was a straight one as the hole in the air filter is directly behind the carb. The later A7's and A10's plungers had aright angled pipe as the hole was at right angles to the carb to allow for the different height of the carb on the A7 and A10 I believe. You can see one in the listing link that Greybeard posted.
Good luck.