I dont run boots on front shocks of my rigs, or on any of the rigs Ive built. As far as the spacer, you could call Bilstein and order some there. Or, you can go to a local hardware store and make your own using washers. Just a thought.
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Bilstein 5100's on all four, Eibach/Toytec front coils, OME rear coils, RCI skid plates, 1.25/1.5 wheel spacers front/rear 275/70/17 BFG A/T KO2's, drop in K&N, Cobra CB, Powerslot Slotted Rotors, Hawk HPS pads and Mobile-1 Lubricants throughout.
The spacer is what concerned me the most as far as getting the lower bushing keeper washer to sit on their correctly and get the proper height/stack spacing through the top mount. The lower bushing washer currently fits too loose for my liking without a collar on there. I didn't mic the diameter of the shaft yet but I assumed I wouldn't find anything with tight enough clearance to fit on the shoulder of the shaft to make me feel comfortable with it. I'll look for a bilstein contact then I guess.
Moved this from 4th Gen thread to Suspension specific....any help ?
Not concerned about philosophy on boots ...just need collars and maybe the stock boots.
Sorry to resurrect an old thread, but I was searching for the same thing and came across this post but no answer. I reached out directly to Bilstein for their confirmation.
That retainer/spacer is called the "Boot Adapter" by Bilstein and is part # E4-B36-398C.
Summit Racing does offer these adapters, but they can be hard to find in stock. If NOT using the boot but only needing the adapter, you might also try a 12mm "shaft collar" that are readily available. Roughly 12mm ID, 22mm OD, so plenty of width for your washer to sit on. 12mm is the diameter of the narrower upper section of the Bilstein shaft
You can find the boot itself (part # E4-SR1-Z012A06) but it does NOT come with the adapter.
I know I'm not helping OP, but for the next person who comes along with the same question, I thought the thread should have its answer!