Elastometric foam spacers for bulkhead to hull joint

[Michail]

Are they structural or simply keep the bulkhead separated from the hull and the only structural element is the fiberglass tabbing which joins the bulkhead with hull?

Can a nonstructural spacer be used?

If they are structural, any suggestions for alternative materials?

[gonzo]

Any soft spacer will work. I have seen rope and bondo used. Foam with beveled edges is my preference.

[Michail]

Thanks again