depends entirely on the brewer. most suspension is shot with a 25g or so, but there are some that fit through 29g's. you'll have to luck out in order to find one - there arent alot. i suspect human grade would fit, but christ it's expensive - perhaps the largest difference between UG and HG of any steroid (except maybe winny)
anyway, just buy some damn pins. they're cheap...also, you really shouldnt use a 1/2" in your delt. there's just no reason for it, unless of course you have a miniscule delt, which means you shouldnt be juicing anyway.