For which non-negative integers $ a<2007$ the congruence	$ x^2\plus{}a \equiv 0 \mod 2007$ has got exactly two different non-negative integer solutions? 
That means, that there exist exactly two different non-negative integers $ u$ and $ v$ less than $ 2007$, such that $ u^2\plus{}a$ and $ v^2\plus{}a$ are both divisible by $ 2007$.
To solve the problem, we need to find non-negative integers \( a < 2007 \) such that the congruence \( x^2 + a \equiv 0 \pmod{2007} \) has exactly two different non-negative integer solutions. 

First, we note that \( 2007 = 3^2 \times 223 \). Therefore, we need to consider the congruence modulo 9 and modulo 223 separately.

1. **Congruence modulo 9:**
   \[
   x^2 + a \equiv 0 \pmod{9} \implies x^2 \equiv -a \pmod{9}
   \]
   For \( x^2 \equiv -a \pmod{9} \) to have exactly two solutions, \(-a\) must be a quadratic residue modulo 9. The quadratic residues modulo 9 are \( 0, 1, 4, 7 \). Therefore, \( -a \equiv 0, 1, 4, 7 \pmod{9} \), which implies:
   \[
   a \equiv 0, 8, 5, 2 \pmod{9}
   \]

2. **Congruence modulo 223:**
   \[
   x^2 + a \equiv 0 \pmod{223} \implies x^2 \equiv -a \pmod{223}
   \]
   For \( x^2 \equiv -a \pmod{223} \) to have exactly two solutions, \(-a\) must be a quadratic residue modulo 223. The quadratic residues modulo 223 are more complex to determine, but we can use the Legendre symbol to check if \(-a\) is a quadratic residue modulo 223.

3. **Combining the results using the Chinese Remainder Theorem:**
   We need to find \( a \) such that:
   \[
   a \equiv 0, 8, 5, 2 \pmod{9}
   \]
   and \(-a\) is a quadratic residue modulo 223.

4. **Checking specific values:**
   We will check each of the possible values of \( a \) modulo 9 to see if \(-a\) is a quadratic residue modulo 223.

   - For \( a \equiv 0 \pmod{9} \):
     \[
     a = 9k \quad \text{for some integer } k
     \]
     We need to check if \(-9k\) is a quadratic residue modulo 223.

   - For \( a \equiv 8 \pmod{9} \):
     \[
     a = 9k + 8 \quad \text{for some integer } k
     \]
     We need to check if \(-(9k + 8)\) is a quadratic residue modulo 223.

   - For \( a \equiv 5 \pmod{9} \):
     \[
     a = 9k + 5 \quad \text{for some integer } k
     \]
     We need to check if \(-(9k + 5)\) is a quadratic residue modulo 223.

   - For \( a \equiv 2 \pmod{9} \):
     \[
     a = 9k + 2 \quad \text{for some integer } k
     \]
     We need to check if \(-(9k + 2)\) is a quadratic residue modulo 223.

By checking each case, we can determine the specific values of \( a \) that satisfy the conditions.

The final answer is \( \boxed{ a \equiv 0, 8, 5, 2 \pmod{9} } \) and \(-a\) is a quadratic residue modulo 223.