Sorry for the delay in my reply. Yes, the retainer is part number #106130. I had to remove the bottom plate of the box magazine that came with the Trophy Hunter. Once the magazine was disassembled, I inserted the metal box over the spring-loaded follower and placed the retainer on the rear facing edge of the box. Then I pressed this assembly into the cavity in the Boyd's stock. Finally I inserted a custom bolt (1/4-28) up through the trigger guard and the stock and through a hole in the retainer until the threads mated with the receiver. There is a savage action bolt available from Midway designed for wood stocks with a box magazine but even that bolt (1 1/4) is too short. I purchased a 1/4-28x2 bolt with hex head (black oxide) from the hardware store and ground it down to about 1 3/8. I made sure it did not interfere with the motion of the bolt lugs. I was able to re-use the OEM plastic trigger guard.
I should probably take all this apart again and take photos to make this clearer.
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