RE: D/S side marker
The chrome is attached to the m/l assy permanantly. The chrome piece has plastic tabs that are pushed through slots in the top of the lamp and then melted. If you could get a new piece of chrome separately, you could, in theory, pop it through and melt it, but its not practical.
I've had good luck breaking the tabs off and making new ones out of plastic from the hardware store and using a two part adhesive to bond it together. Time consuming, but it looks good in the end and costs a far cry less.
Scott