Exhaust Olive

I hope someone on here can help. I need to replace the olive that fits between the downpipe and manifold on my 110 V8. Nobody I have spoken too recognises this part. The olive is about 10mm thick with a bevelled out side edge. It fits into the flange on the top of the exhaust downpipe, and into the recess in the exhaust manifold. The only part people are suggesting is a 2-3mm copper ring. This is not the part I need, and does not seal the exhaust. Does anyone recognise the part i am describing, and either the part number for it, or someone that sells them.

Search google you may find cheaper
Think possibly bosal 256-092 ( you will need to check it is right part number)

NTC1030 fitted on diesels- see if it fits v8 as I seem to think it does downpipes without cats as well