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Slottolution slotcar chassis fits to the body of the Revell E21 320 Gr.5 , for example item 07358. As well as the ESCI and Tamiya 320 bodies....
18D motors fits: Motor diameter max. 25mm, flat-diameter max. 19mm, lenght max. 37mm, diameter flange max. 6,5mm, distance screws 11-13mm
For example: Slotdevil 4020, Johnson 20543 etc.
If you want to use a different motor, please have a look into my shop.
Distance between front- and rear-axle: 107mm Height of the chassis is adjustable +/-2mm
Showed front wheels have outer diameter of 23,5mm and width (all) 12mm Showed rear wheels have outer diameter of 26mm and width (all) 19mm
For question please watch linked Youtube video or write me a mail. Thanks.