The 15x10" will fit without the mini-tub, depending on the tire you are looking to put on it. I have 15x10" with 5 3/4" b.S. and 9x30 slicks. No mini-tub, I just moved the springs inboard, and ordered the S60 to fit. You need the mini-tub for anything wider than 9" slick, or 275's on a 10" wheel.

1963 Belvedere (mine)
1969 Roadrunner (wife's)