Hi
Yes, that is the correct part for the heater air inlet.
You will need
1x BD.22480 Extension Assembly, in Bonnet, for Heater Air Intake
1x BD.28378 Seal, Rubber, for Air Intake Extension
5x UCS.125/6R Setscrew, securing Extension Assembly
5x UCN.125/L Nut, on Setscrews
3x BD.542/3 Washer, Special (oval), under Setscrews
5x FG.104/X Washer, Spring, under Nuts
You also appear to be missing the short rubber sealing strip underneath it on the mudguard (#49 & #50)
http://www.sngbarratt.com/CatalogueProd ... 29&a=15530
1x BD.20816/2 Seal (Rubber) between Bonnet L.H. Rear Diaphragm and Frame Side Member
1x BD.20736 Fixing Strip, for Rubber Seal
4x BD.1814/6 Pop Rivet, securing Fixing Strip
and possibly the one to the side but I can't see in the picture
1x BD.20816/1 Seal (Rubber) between Bonnet L.H. Valance and Frame Side Member
1x BD.20735 Fixing Strip, for Rubber Seal
4x BD.1814/6 Pop Rivet, securing Fixing Strip
The alternator does seem to be an anomaly. I've seen plenty of late 69 and 70 cars with the alternator fitted by the exhaust manifolds when the aircon was not fitted. But it works and will be on factory parts so no big deal really.