Any tips on fitting the US Car Tool Sub Frame connectors?

Here is what I did.

Take a piece of cardboard and trace the contours of the connector itself, then cut it out. Hold that piece of cardboard up to the floor board and trim the cardboard a little a time, until you get a solid fit.

Then transfer the card board template to the connector and you will know where to grind to make the connector fit snug. Hold the connectors up in place with a few bottle jacks. Here are few pics of my installation.

I also had my car on a rotisserie. What I did was lower the frame down on jack stands and made sure the doors opened easily, and checked the rocker (inside of the door) for level. Once you are there, tack them in place and then you can roll the car around to get a better weld angle.

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