Trying to locate missing part

[squirrelthumper]

Hello, people. I am a new member . And have been reading though the posts and was wondering if I might be able to receive some help locating a missing part? A friend of mine just purchased a used gun at a gun show, but it is missing the magazine for it. Here is the specs on the gun:
Sprinfield - Savage .410 bolt action shot gun (model 18)
I have been online looking for the part and have come across a magazine that is a single spring release, however this gun has a double spring release. Any help would be greatly appreciated.

 

[joab]

Have you tried here http://www.e-gunparts.com/model.asp?idDept=221
Look at the series E or C

 

[squirrelthumper]

I will check into that. Thanks for the link.