Pretty simple question, after ordering xs400 exhaust gaskets from mikesxs (http://www.mikesxs.net/product/43-1875.html) I found out that they are for the later models I believe DOHC's (i.e. seca, maxims, ect.). I would just like to know if they can be used in my 1980 SOHC special II instead of the normal copper ones. Thanks in advance