How to find brake caliper gasket/seals for fluid line

So recently I had my front brake calipers apart (as in separated into two halves) doing some maintenance... in reassembly one of the gasket seals in the fluid line from inner half to outer half (about 1cm or so in diameter) was fouled and more/less destroyed. These are the inner seals that prevent leakage when fluid passes between the two halves of the caliper... currently there is no noticable leak but I don't want it to suddenly give out when I need the brakes the most. I'm wondering what these are called in order to find a new set at my local parts shop (no luck thus far), or am I going to have to find one at a junkyard or similar by buying an entire caliper and using the ones from it?

ETA: Its a '96 Tacoma 4x4 4cyl

 

dealership

 

The two local dealerships both told me they don't carry (and can't order) parts for vehicles older than 10 years...

 

guess junkyard would be your best bet