I found out that https://www.bitaddress.org where "Wallet Details" can show various address/public key from private key which list Mini PK well, but unfortunately they don't show the mini PK format
Edit : If you enter mini private key, https://www.bitaddress.org can show compressed/uncompressed address from the mini PK. But what i found is useless since what you have is mini Public Key.
it has nothing to do with "mini private key" and it has absolutely nothing to do with "mini public key" in fact there is no such thing as "mini public key"!
what these coins contain is the first 8 characters of the address which then you will have to look up in THEIR database to find the address. here is the list of Litecoin addresses: http://lealana.com/fulllistltc.txt just CTRL+F inside the browser and you will find the address that belongs to you.
of course i think OP is talking about http://firstbits.net/about.php (https://en.bitcoin.it/wiki/Firstbits) which is not working anymore. which again is another database which you have to look up your lower-cased and shortened addresses inside. there is no workaround.