“what is the difference between the 2 types of installation kits for gas ranges? Both the "GE - Installation Kit for Most Gas Ranges" and "Safety+PLUS - 5/8" ProCoat Safety+PLUS Gas Connector" are offered on the best buy site. Are both required for installation or either one? And the "Safety+PLUS - 5/8" ProCoat Safety+PLUS Gas Connector" is not even available for pickup or delivery, so why bother listing it on the site?”