I'm using Proline AE B4 front hexes in the rear on my xmw. Used AE FT rollpins with a little piece of shrink wrap where it goes through the wheel axle and an additional 0.4mm spacer next to the existing 1mm spacer. Ends up being 0.2mm wider per side than plastic Losi hexes.
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Vega TRF201X
TRF511
F104X
TRF201XMW
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