The following H4 1 1/2" SU spacer is 9.5 or 3/8" thick !!! I have many other spacers with vacuum take-offs and HS4 HS2 HS6 etc etc, some of which are not yet listed. 


Note the keywords attract certain cars but the carb is the most important aspect... Note how this is H4, it is NOT HS4 which was also used on MGA (i am no expert here but i can see the two are different... see how i put in one photo showing the difference.) HS4 ones are available in another listing.



To look for items in my shop, it is easiest to look in the yellow box to your lower left of "categories".   Select the category of interest and all items in that category will appear.  It is much easier than keywords.  
For example "BRAKE"   or   "TRAFFICATOR whole"   or "LIGHTS"   or   "AXLES"   or   "COOLING"  etc etc