Just bought 3rd gen Bilstein 5100s all the way around, got them from SRQ Fabrications. Removed the front two coilovers and then went to assemble the new ones only to discover that no replacement bushings, spring isolators or washers were included. Sure enough on SRQ's website it just said to reuse the old ones. Mine have some cracks and obvious wear, I'm a little hesitant to reuse them. So now it's sitting on jack stands and I'm trying to figure out what to do. I found the Bilstein replacement bushing kit for the rear shocks, but can't find anything for the front ones. I went to Toyota and they quoted me like $40 per shock in bushings which I'd rather not pay. I'm considering just reusing the old for the front two and ordering the Bilstein kit for the rear two. Any advice? It's hard to figure out what is compatible and what is not.

Your post made me check mine lol. My rears came with the bushing and washers. My fronts didn't come with any. So found out Summit Racing has the washer/bushing kits for around 10-12 bucks.
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Part number for washers/ rubber bushiing kit is BSN-B4KT1Z103A00
If you need new top hats and bushings Advance Auto has those kits for around 40 bucks

I just went through the same thing. I ordered everything to rebuild my total chaos front UCA’s from Toytec and had them throw a set of 5100 bushings on the order also. Their part number was 142467 that was for both fronts $20 for the kit.