Here is another isolator kit for SU 1-3/4" carbs as used on the MGA Twin Cam.

Addendum January 2011:
I do not know a commercial source for any parts if it is not mentioned on this we page. Any further information would be appreciated.

At 05:43 AM 4/26/2020, Bo Giersing wrote:
"My YM2 554 was raced in early 1959 fitted with HD8s on a modified manifold. .... I still have the HD8 manifold. See the flex mount solution attached – a cast alloy platte with an O-ring on both sides. I believe that these were used on a particular model of Daimler. These should not be too difficult to make, I think easier than having the manifold machined".