Nose cone appears to be the BNC-20AZ, which is 2.5" long. This makes the body tube an 8" length of BT-20, if you follow the catalog length.
Odd-ball length, IF the catalog length is correct...
Nose cone appears to be the BNC-20L, which is 1.375" long. Subtracting this from the catalog length of 11.5", this gives a BT-20 body tube length of 10.275"...
Body tube -- BT-20B, 8.65" long...
Nose cone -- BT-20N, 2.75" long...
Fin TE sweep -- Nominally 1.1" from tube rear edge to ground...
Main body tube -- BT-50W, 9.5" long...
If calculated from catalog length, tube would be 9.687"; BT-50W is more likely...