One of the links in the above-linked post from the VTCI Forum takes you to a page on the '66 system by Jim Wulf on his tbirdgarage website. This thread from 2015 asked the same question about hose sizes: If you're missing either or both of these canisters, contact one of the T-bird parts vendors that support VTCI and this Forum for a used one or search the ads for one from a parts car or out of someone's parts cache. This is a "coffee/juice can"-like affair with a vacuum check valve at one end and two vacuum hose nipples - one hose to connect the can to the engine, the other to the hose that goes to the vacuum valve/controller mounted on the passenger/right side kick panel (if I remember correctly).
The second vacuum canister you should have would be mounted on the underside of the cowl ledge (same location '63 with vacuum locks and '64-'66 with vacuum locks/Safety Convenience Control Panel option). Someone more-knowledgeable than me on '64-'66s is welcome to correct my description, as the basic configuration I've described - sans the heater control valve - applies for a '61-'63 with A/C. In-between these hoses there should also be the heater control valve tapping off of one of these hoses for vacuum to open and close the valve (I want to think there is a tee between the reservoir and firewall in the small hose for the connection to the heater control valve). Then there is a hose from the reservoir, using the smaller hose (like those used for windshield washer fluid lines from the pump to the nozzles), that goes to the firewall. One hose goes from the intake manifold - with a check valve in-line between the engine and reservoir - to the reservoir using the larger nipple. This is for the A/C reservoir (This location is the same on '61-'65s with A/C - '66 is located under the right front inner fender). One on the passenger/right side of the engine bay, mounted to the front of the shock/spring tower, with two vacuum nipples - one large (7/32" OD) and one small (5/32" OD).
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