diff --git a/fuzzers/042-clk-bufg-config/top.py b/fuzzers/042-clk-bufg-config/top.py
index 0100a156..f26b75f9 100644
--- a/fuzzers/042-clk-bufg-config/top.py
+++ b/fuzzers/042-clk-bufg-config/top.py
@@ -1,18 +1,13 @@
 import json
 import os
-import re
 import random
 random.seed(int(os.getenv("SEED"), 16))
 from prjxray import util
-from prjxray import verilog
 from prjxray.db import Database
 
-XY_RE = re.compile('^BUFGCTRL_X([0-9]+)Y([0-9]+)$')
-
 
 def gen_sites():
-    db = Database(util.get_db_root())
-    grid = db.grid()
+    xy_fun = util.create_xy_fun('BUFGCTRL_')
     db = Database(util.get_db_root())
     grid = db.grid()
     for tile_name in sorted(grid.tiles()):
@@ -24,10 +19,7 @@ def gen_sites():
         ys = []
         for site, site_type in gridinfo.sites.items():
             if site_type == 'BUFGCTRL':
-                m = re.match(XY_RE, site)
-                assert m, site
-                x = int(m.group(1))
-                y = int(m.group(2))
+                x, y = xy_fun()
                 xs.append(x)
                 ys.append(y)