On one set I got, they were converted already using the older Weaver metal trucks with home made bolsters.
On the Lionel Vision Tankers, I ordered the NWSL axles for Lionel trucks w/ spinners.
I did order before there were multiple tread sizes available. I believe I got the smaller flanges. I would suggest getting the larger ones if your track or benchwork isn't the best.
http://www.nwsl.com/uploads/chap3_web_03-15-16.pdf
Lionel ‘spinner’ China
33"/145 Shldr roller brg 1/8" x 1.91"axle 8292-4 18292-4
36"/145 Shldr roller brg 1/8" x 1.91"axle 8293-4 18293-4
33"/172 Shldr roller brg 1/8" x 1.91"axle 8892-4 18892-4
36"/172 Shldr roller brg 1/8" x 1.91"axle 8893-4 18893-4
I forget which is the smaller flanged and which size wheels of the four choices? I'll have to go look at my part bin to see.
I do remember ordering a large quantity (with -100 at the end of the part number). I don't see that anymore?