Special Shipping for certain products

I am using ver 1.39a.

I have a few shipping modules setup.

a) Regular Post
b) Speed Post
c) Special Post for Paint
d) Customer arranges Shipping

I have one product (Paint) which I want only two modules to show up.
c) Special Post for Paint
d) Customer arranges Shipping

Does not matter even if they have other products in the cart but if this product is selected, only two shipping modules should show. How can I do this?

Thanks

In the shipping modules, you will see the $this->enabled ...

When $this->enabled is set to true, the module runs ...

When $this->enabled is set to false, the module does not run ...

The main test is checking if it is installed and if so, it sets it to true ... otherwise to false ...

The IF surrounding the $this->enabled is checking if it should run based on Free Shipping that is managed by a function ...

After that function, you can do your own tests or checks to control the $this->enabled ...