To get best results will need fileing and sanding
can fit Bachmann wgon Wheels 12.6mm
Bachmann 36-030
test fit all parts first
to complet for free wheel will need
https://www.shapeways.com/product/4DX3HQ4N9/canon-de-19-modele-1870-93-taz-1-76-bogie?optionId=97255652