Selden boom

What about updating the pre 2008 sliding cars for new system .I changed the old wheels for new ones but the new ones are quite loose.
 
In France the wheels are sold 3.5 Euros each included vat.Is it possible to fit the new slider cars made after 2008 in the older boom mine is from 2003
 
In France the wheels are sold 3.5 Euros each included vat.Is it possible to fit the new slider cars made after 2008 in the older boom mine is from 2003

That would be good news, can you confirm they are the same wheels because I think there are two sizes? Mine are Selden p/n SE504-347
 
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