Found 3 frames in my Barn, All include the swingarm some have more items with the frames pictures provided on request.
#1 frame # 54-30666753 ( may be June 1973 250cc frame)
#2 frame # 54505 84224 ( may be May 1975 frame ) did not have a dash after the 54 and 505
#3 frame # 550 02866 ( may be a 1976 1977 MC5 GS6 frame maybe a 400cc )
Price negotiable