13" sand tyres ???

Hi again, now i hope this is in the right section, sorry if it`s not, but...

I have some old 13" sand tyres (SandGrippers) yeah they`re pretty old now & starting to perish the side walls,, But they`re such a great sand tyre that i want another pair & am going nuts trying to find some more

Altho they may sound small being only 13",,, they`re actually a pretty big tyre & equal in height & over-all size to the average 15" off-road tyre

Anyone know where i can get them from these days???

Matt berry, you may remember them???, i`m pretty sure i sold them to you years ago & then bought them back off you again after that

sorry,,, just checked, they`re not "SandGrippers",,, they`re "Olympic Sand-Grip"
cheers
Matt