In the recent past I replaced the two into one sections that sit under the front wings and which connect the manifolds to a short linking section which then connects to the silencers sitting under under the running board section of the front wings... It seems the original Morgan stainless short section was of smaller diameter than the stainless silencers fitted to my car. So perhaps best to measure pipe diameters if intending to mix and match..?

Good luck in your choices.