Parts for H&R Topper

[1300_stainless]

Does anyone know where I may be able to find an ejector for an old H&R M-48Topper shotgun in .410 gauge?

 

[mbogo3]

Perhaps Western Gun Parts in Edmonton AB

 

[Sbarkowski]

http://www.brownells.com/.aspx/pid=7115/avs|Make_3=HzzxzzR/ttver=2/Product/EJECTOR

 

[1300_stainless]

I'm going to try Western, how can you tell which brownells one is for .410?