Help adapting crawler wheels to SRB

[ajnin 1]

Anyone know how i can get these wheels adapted to SRB axles? im excited about the look, but the inner wheel hole is narrower than the SRB axles. these are the  wheels in question, RC4WD ( Part # Z-Q0009 ) Z . not sure what their inner diammeter is but its a smidge to narrow. there is an allinum insert that is the hub more or less. thanks for the look! these are 5.2mm and im struggling to find out what diameter the srb axles and who to get bits to fit these. 

[Superluminal 3750]

Whats on the other side of the rim to drive it? Is it a typical 12mm hex?

[TWINSET 1793]

 

I would've thought the thru-hole should be at least 5mm, but RC3WD's QA dept. do let a lot slip through uninspected
Drill the centre hole out to 5mm and an SRB axle will fit - SRB axles are 5mm dia as they pass through an 1150 (11 x 5mm) bearing

You'll need a set of 12mm hexes, something like THESE but you'll have to check the length

The hex replaces MB12 here;

 

 

[SupraChrgd82 1425]

The Hornet uses SRB-compatible wheels.  This kit will likely suffice to fit 4 x 12mm hex driven wheels. 

 

12mm HEX Adapter 4pcs for TAMIYA Grasshopper/Hornet/Frog/Wild One/Grasshopper 2 | eBay