Budget guidance - swapping posts from a kit

Title should read: swapping parts*

Looking for input here on whether or not I can get some money back in the budget.. 

I previously ordered a set of king pin bushings for ~$26+ shipping. Price here is important, but parts won't be used.

Next I realized what all I need and spent $179 on a total front end kit from the same vendor, including more of the same bushings.

Now, a different vendor is offering the same bushings for total of $2.. is it possible to buy and swap these into my kit, and take $24 back?

Why wouldn't you just use the complete $179 kit and remove the now-redundant $26 bushings from your budget completely?

In reply to AngryCorvair (Forum Supporter) :

Now-redundant $26 kit is out, already, based on the $179 kit from the same vendor.

I was wondering if, knowing that ~$26 of the $179 came from these bushings, I could buy and use the discounted bushings for $2, and subtract the difference of ~$24 from the kit

I don't think so. 

But I'd still buy the $2 bushings, can you get the other kit parts cheaper from another source? You can put together your own kit from various sources to come out ahead of you need to.

I think the question is:

if you only use part of the $179 kit, is it still $179 or can you prorate it?

I don't think you can pro-rate from a kit. That would be like buying a car (essentially a package deal of car parts) and pro-rating the engine out because you just want the chassis. IMO you would have to actually sell the engine. Sure there's FMV, but I'm not a big fan of over-using that rule. Now if you can sell the unused bushings, go ahead and then it would count towards recoup. 

Cool, thanks for the input guys. I hoped it would be doable but makes sense it doesn't work that way without selling the bushings that came with the kit. I'm ordering some other items from them as well, so I'll add the $2 bushings and see what I can do from there.

I'm a little fuzzy on the exact specifics mentioned here, but this paragraph from the rules might be helpful:

A part’s cost may be pro-rated by weight or quantity if from a homogeneous parts lot (example: zip ties, nuts and bolts, a box of 20 identical axle shafts, etc.), or relative retail value if it was purchased as part of a heterogeneous parts lot (all-you-can-carry sales, storage unit buyouts, garage cleanouts, etc.) Relative retail value is calculated as follows:

1. Assign and prove a fair market value to every part in the lot.

2. Add those fair market values together to calculate the total fair market value of the lot.

3. Express the fair market value of the part you are pro-rating as a percentage of the lot’s total fair market value.

4. Multiply the actual price paid for the lot by that percentage in order to determine the part’s relative retail value.