Can I do this with Permalinks?

Hi, well my permalinks are working fine and all that, I have this structure /read-id%post_id%-%postname%-hello.html
I want to change the structure to /read-id%post_id%-%postname%-bye.html

I know how to do it, but when I do that, the one I had before stops working, so all the people and search engines will not find the page. Is there any way to make both structures work at the same time? I tried editing my .htaccess with some lines which work on normal PHP.. but wordpress comes up with Internal Server Error…
Here is the one I tried:

RewriteRule ^read-id([0-9]*)-([[:space:][:punct:]/:\-\'{}()._&a-zA-Z0-9+=]*)-hello.html index.php?p=$1

Just to add info to help somebody.. my actual .htaccess is this:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

Thanks in advanced..