yeah what do you require
I used a 1994 cbr600 fn swingarm and pivot bolt.
rear shock from cbr 600 fn
it will not fit CB 550 K without a slight modification that is a slight thinner spacer on the right hand side swingarm or cut it down if you are good with hacksaw. and take off 2mm.
the pivot bolt holes in the frame are 14mm 600 swingarm pivot bolt 15mm
again where the pivot bolt goes throught the frame on the outsides you nee to trim the flanges down. and get a longer bolt approx 330mm long x 15mm thick
then where centre stand mounts you need to for a mount for the dog bone linkage