here is a link to the factory assembly manual which may show that, I took a quick look and didn't find it. it is good to download a copy for future reference anyway. if in doubt the axle, when installed, should have the kingpin bore positioned so the top of the bore is slightly behind the bottom of the bore which will give you some castor. the original springs may have the bottom leaf tapered already, if it still has the original leaves.
maybe somebody on here has a pic, I took mine out and gave it to a ratrod guy locally so it went with the springs attached. sorry.
https://www.trifive.com/d1/55-59Assy.pdf