For what it's worth, I regret buying aftermarket clear indicators. I haven't had any leaking problems, but after learning of the superior quality, appearance and additional parking light of the genuine articles, it would have been worth the (considerable) extra.
The only reason I don't 'upgrade' soon is because there is so much to be done first...
Jack Travis, E-Series Acting President
1989 Ford Fairmont Ghia turbo/GL replica (underway)
1994 Eunos 800M
1990 Ford Laser S