@sharkbait Yes, it would be set by the plugin.
But the plugin can be set like this:
$modx->setPlaceholder('36_month_new_car', $x36_month_new_car);
$modx->setPlaceholder('48_month_new_car', $x48_month_new_car);
$modx->setPlaceholder('60_month_new_car', $x60_month_new_car);
And for Plugin Configuration box:
&x36_month_new_car=36_month_new_car;string;Set number!
&x48_month_new_car=48_month_new_car;string;Set number!
&x60_month_new_car=60_month_new_car;string;Set number!
Then the placeholders:
[+36_month_new_car+]
[+48_month_new_car+]
[+60_month_new_car+]
Can all be set from the Plugin Configuration!
--EDIT-- Must use "&" in config box.