def getRadarProductIDs(availableParms):
    """
    Get only the numeric idetifiers for NEXRAD3 products.

    Args:
            availableParms: Full list of radar parameters

    Returns:
            List of filtered parameters
    """
    productIDs = []
    for p in list(availableParms):
        try:
            if isinstance(int(p), int):
                productIDs.append(str(p))
        except ValueError:
            pass

    return productIDs