Your gonna have to find one use or someone to part with one. (good luck). There have been people looking for years for any of the TRP's. I'd say get creative and make one personally. I was fortunate to buy one of the last sets in the US last year. Maybe someone will do a run of some at some point.
I think i may be able to help mate, I am in talks with Frazer at WDP to acquire a G7 mini-reg grip panel so will ask if he can dig out what you need, if so, I'll post up here soon and hopefully be able to sort you out.