[steven s]

Create a new profile field, name it 'Car'.
That new profile field will have a number.

In your postbit or posbit legacy templates
Find

<if condition="$post['rank']"><div class="smallfont">$post[rank]</div></if>

Add below

<if condition="$post['fieldX']">
<tr><td class="vbmenu_option">Car: $post[field]X]</td></if>

Note: X is your profile field id
I suppose there are other ways to format it.