I have an R1 sitting out there. It has the lifter bosses for the 48 degree LBA but it is drilled for the 59 degree LBA. If I'm stuck running a Comp lifter I'll skip that and use a mushroom flat tappet cam instead of a roller.
Have a look at comps relatively new sportsman lifters.
They are not the endurex lifters. I like the staked axles, no clips to fall out and no needle bearings.
