How would you hard code a breadcrumb on the product page?

[gigismith]

Hey!  

I have recently added breadcrumbs to our site which is great except that we have a unique product set and I really need some of our product pages to have a manual/hard code for the breadcrumb trails.

See 2 screenshots.  Because our kit sizes are actually different products, but nested together, we are losing the breadcrumb when you switch to a different size/option.  I don't want to add every size to the collection page because it would make the product catalog get completely out of hand since they are the same product images, just different sizes.  

I feel like this should be fairly straight forward? 

Thank you for any help! 

[gigismith]

For some reason the images didn't post so here is the comparison!