Wrong Master Cylendar

Two more little lines to go and the brake lines are done, BUT.......The front line out of the MC is 5/16 and the rear line is 3/8..... Did my parts guy give me the wrong MC?

Doug here's the lines that are used with the 2nd gen master cyl. All NAPA #'s.



Links to the two lines from the master cyl.

http://www.napaonline.com/Catalog/CatalogItemDetail.aspx/Brake-Line-Assembly-Adapter-Metal-3-16-/_/R-BK_8131156_0361076748

http://www.napaonline.com/Catalog/CatalogItemDetail.aspx/Brake-Line-Assembly-Adapter-Metal-1-4-/_/R-BK_8131157_0361076746

Hope this helps.

Thanks wideload , my system has a distributor block to light the idiot light if either the front or rear brakes fail..... Problem is the block has a 5/16 hole and the MC has a 3/8 hole I'll see if i can find that combination.

This is for converting a single line master cylinder on a 64-66 1st Gen  to a 2nd Gen 67-70 dual line,,,,,,so what are you doing on that 67,,,,,replacing just the master cylinder or replacing the brake lines?

great info guys, thanks!