We have a new(used) backhoe without a block htr, a necessity here in WY. The driver's side(L) has 4 freeze plugs but has a steel hydraulic line right in front. The R side is pretty inaccessible. The L side will probably work by gently retracting the lines a little if there is clearance for the htr. Does it matter which freeze plug is used? The forward one is the most accessible.