Does anyone know if the demand lever in a 5th gen air 2 is the same part as the one in the 3rd generation air2? I'm rebuilding one and can't find a parts list for this latest air2. The 3rd generation reg uses part number 21.009.121 (and I can buy one on ebay) but I would like confirmation that its the right part before ordering. Ideally I'd like to see an exploded drawing/part number list for a 5th gen air2. Thanks!