Tyre Sizes

[TNSL]

Hello to you all.

I am new here, and to karting.

Ok i brought my son a bambino kart don't know the chassis, but the engine is a Comer if that means anything thing to you.
i need to get some new or used tyres for it, but am not sure what tyres will fit the rims. Here are the numbers from the tyres and rims i have.

Front

Tyres:- Vega 10x4.00-5 Rims:- Free Line 5" CH110

Rear

Tyres:- Vega 10x4.60-5 Rims:- Free line 5" DH150

I have had a look on ebay but have found nothing with them numbers, also i have seen SL3 SL8 etc... but no sizes with them so don't know what to get.

Next question, if i see a set of junior rims with tyres that are different sizes to what i have, will they fit on the kart ok.

Sorry if the question are dumb, but as i say i am new to all this karting.
I am sure that i will be back with a lot more questions in the future.

Thankyou

Tony