I have a couple of rear lower trailing arms complete with the hat that holds the rear spring in place.   They have been  around for a long time and show little if any rust.  I had them in my car (67 Impala 2 dr hdtp) for a short period while the original arms had the eurathane bushings put in.  

Also available is a used strap for the motor mount to keep the block from moving under hard acceleration-- or broken motor mounts.  Bracket, clevis pin, bolt, spacer and cotter pin, strap that connect both. 

Price negotiable-- half of which goes to CP Forum

Cliff