I and, from the number of posts, many others have spent time bending, swaging, welding, extending etc. both siamese and twin pipe set-ups to get an acceptable fit. Wherever you decide to buy pipes it’s possible you’ll have work to do.
If you find pipes that fit first time let us know where! But, as pipes are essentially hand made, the next customer may not be so lucky.
Another thought - with stainless, if mods are necessary, at least the finish is readily recoverable.