Hi geronimo....
the pins are for locating the beast under the belly of the Ar 234C.
Its a single pojectile...2 body halves, 1 with fin and 2 extra fins to be arranged at 120 degrees spacing between each fin.
The make of model is Dragon and this "mystery" is also included in the Revell version of the Ar 234C3 & Ar E381.
I've checked both the Dragon and Revell instructions but there's no reference name included just part no's and assembly diagrams.
If it helps...part no's are Dragon sprue "C" no's 11, 23 and 2x 22.
Revell sprue and no's same...as the Revell is a re-boxed Dragon.
If you can crack this I think you deserve a new name...Sherlock.
Thanks for all your help.
Prost
Peter