Adding Read-Only-permissions to a list for a Sharepoint Group using Powershell CSOM

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PowerShell

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SharePoint2013

I am trying to add read-only-permissions to a specific group called "Students" for a list I have created called "Quiz". I have to use PowerShell CSOM, and in every other tutorial I've been through, .NET server types have been used.

Code:

$ListName = "Quiz"
$PermissionLevel = "Read Only"
$web = $ctx.Web

$lists = $web.Lists
$ctx.Load($lists)
$ctx.ExecuteQuery()
foreach($list in $lists)
{
    if($list.Title -eq $ListName)
    {
        $listId = $list.Id
    }
}
$list = $lists.GetById($listId)
$ctx.Load($list);
$ctx.ExecuteQuery();

Write-Host "List:" $List.Title -foregroundcolor Green
if ($list -ne $null)
{
    $groups = $web.SiteGroups
    $ctx.Load($groups)
    $ctx.ExecuteQuery()
    foreach ($SiteGroup in $groups) {
        if ($SiteGroup.Title -match "Students")
        {
            write-host "Group:" $SiteGroup.Title -foregroundcolor Green
            $GroupName = $SiteGroup.Title

            $builtInRole = $ctx.Web.RoleDefinitions.GetByName($PermissionLevel)

            $roleAssignment = new-object Microsoft.SharePoint.Client.RoleAssignment($SiteGroup)
            $roleAssignment.Add($builtInRole)

            $list.BreakRoleInheritance($True, $False)
            $list.RoleAssignments.Add($roleAssignment)
            $list.Update();
            Write-Host "Successfully added <$GroupName> to the <$ListName> list in <$site>. " -foregroundcolor Green
        }
        else
        {
                Write-Host "No Students groups exist." -foregroundcolor Red
        }
    }
}

My error is in

$roleAssignment = new-object Microsoft.SharePoint.Client.RoleAssignment($SiteGroup)

, where I'm recieving the error

Cannot find an overload for "RoleAssignment" and the argument coun
t: "1".

Most tutorials use

$roleAssignment = new-object Microsoft.SharePoint.SPRoleAssignment($SiteGroup)

which I CAN NOT USE.

How can I complete my code?

P.S. I know my code is a bit messy, but I've been spending too much time trying to find a solution, and my code has greatly reduced in quality over the past hours. Sorry for that.