The heel is the same size regardless of the nut size. Just the shaping of the neck pocket for an R5 neck is a bit less tapered on the lower horn side, if at all. So it may or may not fit, depending on how precise the routing is.
Yea i hear what us sayin xxx but ive got several necks and my r2 87 neck is over 2 3/16 by a 16th and my 86 beretta neck is 2 316th with r2 nut, just seems that the r5 nut wld have a bigger heel print like 2 1/4 as my 84 pacer neck is a r5 with a hair under 2 1/4 heel??
But as people have stated before kramer/esp was not exaclty crucial spec's but rather +/- 2 3/16.
Thx for the reply brother