Looking for a specific gas block

[MartyK2500]

Hey guys hope someone can help
I am looking for a clamp on railed gas block, receiver rail height, so the height of rail on block would be same than on receiver.
Found many non exporting usa sites that have them, cant seem to source one up here.
.750"inner dia too

 

[garybusey]

brownells has like 10 different kinds
http://www.brownells.com/rifle-parts/gas-system-parts/gas-blocks/index.htm?f_a=1

 

[MartyK2500]

Yes there is quite a bit to browse through, the only high rail plane is not quite the one i'd like. Ideally i would love to find a clamp-on gas block that looks like this one

http://www.theammosource.com/index.php?main_page=product_info&cPath=2_24_392&products_id=1630