While the supply chain has somewhat normalized, the reality of the wheel industry at this point in time is that it is driven by the modern vehicle market, and as such the smaller diameter parts, that is to say 15-19", are being phased out in favor of larger 20"+ parts as OEM wheels grow in diameter.
Your custom wheels require what is known as a "blank" lip or barrel, which is a smaller inner diameter, with no holes drilled.
There are no universal parts. These "blank" parts are made to order specifically for us, and no one else.
The rest of the wheel industry making modern style wheels are using what is known as "US40" which is a 40 hole pattern accepted as the industry standard for modern production wheels.
Vintage Japanese and European wheels DO NOT USE THIS PATTERN.
Most blank parts on the US market are made for us, and then we distribute them to smaller retailers. We buy tens of thousands of parts per year, and maintain one of the largest stocks of lips/barrels in the world. If we are out of stock, so is everyone else.
This means that production of small diameter, and especially small diameter/high width parts in blank form which is basically anything over a 5" wide part, are produced once a year at best. We have these parts constantly on order, and fill orders as they are available, but the current reality of the wheel industry is that it is not profitable for manufacturers, and distributors like us, to make these parts in many cases. We do this out of a love for vintage wheels and the desire to see them restored and kept on the road.
When we have blank parts in stock, our sales reps can quote you an ETA based on our in-house machining and finishing queue. For special orders: AS A RESULT OF THESE FACTORS, WE ARE NO LONGER QUOTING ANY FORM OF ETA ON LIPS AND BARRELS FOR VINTAGE JDM WHEELS. You will receive your order when it is done. If this lead time and lack of information is unacceptable to you, we suggest you do not buy these parts and instead choose one of our hundreds of in-stock pre built wheels that ship within a few business days.
Unsure what parts you need? Please read this guide: https://www.threepiece.us/lip-barrel-information/