Hello all!! Haven't been on in awhile but I was wondering if anyone knew where I could find an oem trailer 4 pin style plug? I have the original round style receiver but the original 4 pin receiver had been cut and removed from the bracket holding the two plug receivers in place. I purchased a simple plug receive from wal mart but it doesn't fit in the bracket. Thanks

 

https://www.etrailer.com/p-118242.html

OP has: 1999 F150 5.4l Lariat

 

If the 7 pin still works, you can use this for 4 pin trailers:

https://www.etrailer.com/Wiring/Pollak/PK12716.html