Eddy welcome aboard.
Are your letters the plastic gold ones? If so I think this are very hard to find some have gone to newer or custom letters and some just remove them.
Wiper arm can be found at boating supplys stores local to you and on line, some RVs stores may have what you need as well.
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2