Paul,
So that we may communicate clearly please use the "Technical" reference diagrams from the PGCA main webpage. The links below will open to the diagrams and the list below provides the proper names of parts.
I thought you needed 2 seperate parts until I looked at the diagrams and realized that you need only one:
Part# 28) Safety lever and jacket
http://parkerguns.org/images/parts.jpg
http://parkerguns.org/images/tech_2.jpg
1) Right-hand hammer
2) Left-hand hammer
3) Hammer stirrup
4) Main spring
5) Main spring plunger
6) Sear
7) Sear spring
8) Right-hand trigger
9) Left-hand trigger
10) Trigger spring
11) Top lever
12) Extractor
13) Cocking slide
14) Bolt lever, with roll 15) Square top bolt
16) Round top bolt
17) Roll
18) Roll pin
19) Top lever spring
20) Trip, spring and pin
21) Unhooking slide
22) Cocking crank
23) Cocking hook
24) Cocking hook pin and spring
25) Cocking hook screw
26) Safety pin
27) Unhooking pin and spring 28) Safety lever and jacket
29) Safety slide
30) Safety slide spring
31) Sear Pin
32) Bushing for tang screw
33) Fore end lock, complete
34) Fore end lever
35) Fore end tumbler
36) Fore end lever spring
37) Guard bow
38) Trigger plate
39) Fore end iron