www.macgregorukcarparts.com - Martin MacGregor is in Canada and has been in business since 1981. He is a great source for all rubber parts, but has other items as well. He is very personable and generally answers the phone himself. I have never been disappointed in his products. A toll free telephone number is 1-877-777-6381.
www.bobsradio.com - Have not personally dealt with this guy, but my dad's shop has had work done by him. Restoration of auto radios and does conversions to AM/FM while keeping original appearance.
www.antiqueautobattery.com - They build antique batteries. I have two 6 volt batteries made by them. They are "Lucas" branded cases with tar tops just like the originals the '73s and earlier came with from factory.
www.classictube.com - This company makes any and all metal tubes for almost any car, including MGs. They provided a rear cross over brake line that fit exactly without further bending. They do tubes in original metals or will do stainless steel. Most of the time they have the tube in stock and ship quickly.
www.britishwiring.com - Anything you need for original wiring work they have. Cloth covered wiring looms for MGs in the '60s, bullet connectors, colored wire, complete wiring harnesses, crimping tools, etc. I replaced my entire rear loom with one of theirs. Everything was exact and fit like a charm. Owners answer the phone (British) and are very helpful.