Any magazine (not clip) that works for the 1911 will work in a bob tail.
Brownells has what you need for a main spring housing. Image of my Ed Brown.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)