Adding another 50 amp Receptical

[RonS]

I want to place my autoformer in the bay where I plug into with my 50amp cord. Autoformer is made to work outside pluged into shore power ped, and then my cord into it and then to RV. I want to put the autoformer on the other end of the power cord. But I need another 50 amp receptical. Something similar to the one we all have on our RVs. Where can I get either a used one or a better price than 68 bucks??
Originally I had taken the end off my cord, and then in its place a plug in. But when the autoformer went out I had no way to get power to RV. Did you ever try to change ends on 50 amp cord in the dark. Not going to try that anymore.
Thanks.....Ron