Silencer joint seals too big?

I bought two sets of exhaust joint seals from David Silver for my VF1000R. The rear cylinder ones fit perfectly and will tighten up nicely. The two that seal the rear silencers to the collector box appear to be too big (thick) and even widening the opening they will not fit. Photo shows the old seal next to the new one. The old one looks much thinner than the new one given that there would be limited compression of the seal. Silencers are Sankei 2217 which I believe are correct for 1984.
Anyone had this issue?20201013_130933

Watching: I’m curious about what people have to say about this too. I’ve found the same to be true with the stock exhaust and seals/gaskets from the collector to the mufflers on my 1984 VF1000F.