diff --git a/fuzzers/018-clbram/top.py b/fuzzers/018-clbram/top.py
index d185a107..1de15ff2 100644
--- a/fuzzers/018-clbram/top.py
+++ b/fuzzers/018-clbram/top.py
@@ -25,8 +25,6 @@ CLBN = 50
 print('//Requested CLBs: %s' % str(CLBN))
 
 
-# Rearranged to sweep Y so that carry logic is easy to allocate
-# XXX: careful...if odd number of Y in ROI will break carry
 def gen_slicems():
     for _tile_name, site_name, _site_type in util.gen_sites(['SLICEM']):
         yield site_name
diff --git a/fuzzers/019-ndi1mux/top.py b/fuzzers/019-ndi1mux/top.py
index 714d38de..fbb3a312 100644
--- a/fuzzers/019-ndi1mux/top.py
+++ b/fuzzers/019-ndi1mux/top.py
@@ -2,48 +2,15 @@ import random
 random.seed(0)
 import os
 import re
-
-
-def slice_xy():
-    '''Return (X1, X2), (Y1, Y2) from XRAY_ROI, exclusive end (for xrange)'''
-    # SLICE_X12Y100:SLICE_X27Y149
-    # Note XRAY_ROI_GRID_* is something else
-    m = re.match(
-        r'SLICE_X([0-9]*)Y([0-9]*):SLICE_X([0-9]*)Y([0-9]*)',
-        os.getenv('XRAY_ROI'))
-    ms = [int(m.group(i + 1)) for i in range(4)]
-    return ((ms[0], ms[2] + 1), (ms[1], ms[3] + 1))
-
+from prjxray import util
 
 CLBN = 50
-SLICEX, SLICEY = slice_xy()
-# 800
-SLICEN = (SLICEY[1] - SLICEY[0]) * (SLICEX[1] - SLICEX[0])
-print('//SLICEX: %s' % str(SLICEX))
-print('//SLICEY: %s' % str(SLICEY))
-print('//SLICEN: %s' % str(SLICEN))
 print('//Requested CLBs: %s' % str(CLBN))
 
 
-# Rearranged to sweep Y so that carry logic is easy to allocate
-# XXX: careful...if odd number of Y in ROI will break carry
 def gen_slicems():
-    '''
-    SLICEM at the following:
-    SLICE_XxY*
-    Where Y any value
-    x
-        Always even (ie 100, 102, 104, etc)
-        In our ROI
-        x = 6, 8, 10, 12, 14
-    '''
-    # TODO: generate this from DB
-    assert ((12, 28) == SLICEX)
-    for slicex in (12, 14):
-        for slicey in range(*SLICEY):
-            # caller may reject position if needs more room
-            #yield ("SLICE_X%dY%d" % (slicex, slicey), (slicex, slicey))
-            yield "SLICE_X%dY%d" % (slicex, slicey)
+    for _tile_name, site_name, _site_type in util.gen_sites(['SLICEM']):
+        yield site_name
 
 
 DIN_N = CLBN * 8