Another Str_Replace Question (vB4 & vB3)

[ChiNa]

Hi everyone, I saw the other thread answered by Kh99 and Scanu..

I am working on a project, my plan is to build a Product, for example Bookmark-Buttons that I wanna add in POSTBIT and POSTBIT LEGACY! I have to the buttons "On top of the Signature" or simply replace the "Signature Start"! So far I have made this done with the help of a few friends for vB 3.8. And thanks to Scanu for his contribution and help the other day. Now I wanna publish my Products for vB4.x also! And I have 2 simple questions..

First my replacement code: (for vB3.8) worked perfect:

$replace = '$template_hook[postbit_signature_start]';
        $vbulletin->templatecache['postbit'] = str_replace($replace,$replace.fetch_template('MYCODE'),$vbulletin->templatecache['postbit']);
        $vbulletin->templatecache['postbit_legacy'] = str_replace($replace,$replace.fetch_template('MYCODE'),$vbulletin->templatecache['postbit_legacy']);

Question 1: I have only made a few modifications, but dont know about the vb 4.x system yet. Now what should I change in my replacement code, to make the code fit on vBulletin 4.x! Obviously my vB3.8 code didnt work on vb 4.x

Here is the line where I wanna start my replacement in vB 4.x Postbit and Postbit Legacy:

{vb:raw template_hook.postbit_signature_start}

I have followed the other thread, where kh99 replied with:

$myput = '<!-- message area -->';
$replace = '\'; $final_rendered .= \'' . $myinput . substr(fetch_template('new_posting_newthread'), 19) . ' $final_rendered .= \'';
$vbulletin->templatecache['newthread'] = str_replace($myput,$replace,$vbulletin->templatecache['newthread']);

I can see that this is 1 Template Change. How to do 2 changes in 2 different Templates, using 1 xml product. As you can see I have to replace Postbit and Postbit legacy... So I really hope I can get an exact same code or explanation for vB 4.x!

Thank you very much in advance,