Replace Function in Cold Fusion

Hello All,

The code below does the following: It finds an item in Spanish (in this case it's GetBasket.options, 2) and add `SPA` to the SKU code.

<cfif ListContains(GetBasket.options, 2)><option value="2"><cfset basketsku = GetBasket.SKU & "SPA"></option></cfif>

How do I do the following?

The SKU code is a 5 digit code for all languages. For example: the SKU code in English is 902013, but the SKU code for Spanish is 903013. As you can see the 3rd number is being replaced with 3. It will be standard for all items in Spanish. How do I modify the code above to replace the 3rd number with 3?

Thank you all very much in advance!