Is there a Smaller Brake Booster That I can buy?

[blkcorvair]

I currently have the stock 11" Brake booster on my 69 c10. Im doing a LS Swap and my valve covers are tall so I want to get a smaller diameter brake booster. I see alot of Smaller and dual diaphram setups but they all seems like complete setups. Im really looking for a Smaller booster that I can bolt on as I have everything else already. Id prefer something that I can cross to a different vehicle so if I ever need a replacent I can go to my local parts store.